A wall module, a wall panel, and a system formed therefrom

Abstract

A wall module for soil and plants for use in a living wall system, the module comprising a body, the body comprising a back wall, a first side wall and a second side wall. the body further comprising

Description

Technical Field of the Invention The present invention relates to a wall module, a wall panel, and a system formed therefrom. In particular, the invention relates to a wall module for soil and plants, and a wall panel for affixing to a structure to support the wall module. Moreover, particularly, the system formed from the wall module and the wall panel may be a Living Wall system, or a green wall system. Background to the Invention A Living Wall system comprises one or more modules connected to a wall (i.e., wall modules), typically a vertical wall, which can be on the inside or outside of a building. The Living Wall system provides the effect of a wall made of plants and other foliage. By ‘plants’, we mean all types of plants and flowers, including fruit and vegetables. Beneficially, Living Wall systems are aesthetically appealing, improve air quality, enhance local biodiversity, can provide a positive social effect such as by reducing stress and increasing creativity, and can provide a carbon-offset benefit to the building on which it is installed. Moreover, Living Walls help to clean the air by trapping particulate matter including black carbon and removing significant amounts of nitrogen dioxide, therefore, helping to mitigate climate change and reduce serious cardiovascular disease. Living Walls can also improve the thermal performance for buildings through insulation and shading, helping to reduce the urban heat island effect. Wall modules are incorporated into Living Wall systems in order to provide a holder for the plants and, typically, provide a support to an irrigation system which provides the plants with water and nutrients. The module may take a variety of forms but is typically an open container which accommodates at least one blade, which provides support for one or more plants. Typically, modules are affixed to a wall using a standard attaching means, such as a hanging rail or fasteners. Typically, in use, each blade is orientated at an angle such that the one or more plants are positioned on, and supported by, the or each blade. Thus, in use, the or each plant is enclosed within walls of the module and the blade but is accessible via an open face of the module. Stringent guidance relating to the use of cladding and other building materials means that there is a need to provide a Living Wall system which minimises and restricts the speed of air exchange between an area behind a wall module and the face of the wall structure to which the wall module is fixed. Known wall modules used in conventional Living Wall systems often experience horizontal ‘drift’ during installation which can disadvantageously impact build tolerances and, in severe cases, result in a Living Wall system in which gaps can be seen between adjacent wall modules, therefore, diminishing the desired aesthetic appeal of the Living Wall system. Further disadvantageously, in known wall modules for Living Wall systems, excessive root growth of the plants positioned in the wall module can cause the walls of the module, for example side walls, to bow or even buckle. In such cases, the wall module can be displaced from its intended position and negatively affect the irrigation of the Living Wall system. Even further disadvantageously, known Living Wall systems rely on a nondescript hanging rail (for example, a French cleat) or fasteners upon which a wall module is hanged. The hanging rail or fasteners typically comprise no specific features which facilitate the installation of the wall modules or which lend themselves to specific use in a Living Wall system. Moreover, the hanging rail or fasteners typically comprise no features which improve the accuracy with which the wall modules are installed. Conventionally, the speed and accuracy of the installation of a Living Wall system is largely dependent upon the speed and skill of the installer. It goes without saying that an installer who is not as skilled in this art may therefore take considerably longer to install a Living Wall system, and to a reduced quality, compared to a peer who is of greater skill. Known hanging rails and fasteners are prone to buckle or bend upon the load of a wall module, for example if the soil in the plant module becomes excessively wet. A small load-bearing capacity and, therefore, a relatively weak structural integrity, of a Living Wall system can result in the modules bending the hanging rails and / or fasteners out of shape, such that the modules may be displaced from their intended position within the system and damage the irrigation of the Living Wall system. It is an object of the present invention to overcome these and other disadvantages, and / or to provide an improved wall module, wall panel and Living Wall system. Summary of the Invention According to a broad aspect of the invention, there is provided a wall module for soil and plants for use in a living wall system. The module may comprise a body. The body may comprise a back wall. The body may comprise a first side wall. The body may comprise a second side wall. The body may comprise at least two cells. The at least two cells may be separated from one another by a blade. The blade may be angled with respect to the back wall. The back wall may comprise a mounting depression. The mounting depression may comprise a hanging means for hanging the wall module to a wall structure. According to a first aspect of the invention, there is provided a wall module for soil and plants for use in a living wall system, the module comprising a body, the body comprising a back wall, a first side wall and a second side wall, the body further comprising at least two cells, the at least two cells being separated from one another by a blade angled with respect to the back wall, and wherein the back wall comprises a mounting depression, the mounting depression comprising a hanging means for hanging the wall module to a wall structure. Advantageously, in the invention, the mounting depression comprises the hanging means and so the hanging means is inset within the body of the module. Beneficially, this means that a significant portion of the back wall, in particular a significant portion of the back wall relative to known wall modules, sits flush against the wall to which the module is hanged, and secured, in use. This reduces the volume of a void, or air gap, which can exist between the module, in particular the back wall, and the face of the wall to which the module is secured in use. The reduction in the volume of the void means that the amount of ventilated air between the module, in particular the back wall, and the face of the wall to which the module is secured in use is also significantly reduced. This is of particular advantage because the reduction in the amount of ventilated air between the module and the face of the wall restricts the speed of air exchange between the air in the void and external air. It has been found that the restriction of air exchange provides multiple advantages, for example significantly reducing the potential of fire spread which provides clear safety benefits, in particular in view of recent changes to building regulations relating to the use of cladding, and significantly reducing condensation build up in the area between the module and the face of the wall. In terms of fire safety, advantageously, the lack of, or significantly reduced, air gap between the module and the face of the wall to which the module is secured in use prevents, or at least significantly reduces, a ‘chimney’ effect in the event of a fire. The chimney effect exists in cavities and air gaps in facades, in that fire in the air gap behind cladding can spread quickly as oxygen in the air gap is utilised, the fire seeks more oxygen and moves rapidly upwards. As such, the lack of or reduced air gap between the module of the invention and a wall means that the chimney effect is at least significantly reduced. Moreover, the restricted speed of air exchange between the air in the void and external air beneficially means that even is significantly strong wind conditions, there is a considerably reduced possibility that the wall module will detach from the wall to which it is secured as there is a reduced volume for the wind to enter behind the wall module and force the module away from the wall. The invention therefore provides for a more reliable wall module with a reduced possibility of detachment from the wall. Further, the air gap allows enhanced thermal abatement. Beneficially, a reduction in the build up of condensation means that the wall, or structure, to which the wall module is secured remains dry, or at least relatively drier than if condensation was allowed to build up, preventing water run-off down the wall or wall structure onto the ground below the Living Wall system, which would be aesthetically displeasing. It is known to provide wall modules for Living Wall systems which comprise a furring strip, or similar, to create a defined gap between a building wall and the wall module. The purpose of this is typically to promote the flow of air from the void between the building wall and the wall module, for example to aid the evaporation of water which may be trapped following rainfall. Such known modules, therefore, are designed to promote the flow of air between the wall module and the building wall. As detailed above, the present invention aims to provide the opposite effect to such known wall modules. The back wall may comprise an outer facing surface and an inner facing surface. The outer facing surface being the surface of the back wall which faces away from the wall structure to which the wall module is secured when in use. The inner facing surface being the surface of the back wall which faces the wall structure when in use. The inner facing surface may comprise the mounting depression. The back wall may be considerably planar, save for the mounting depression and hanging means. The back wall may comprise an upper portion. The back wall may comprise a middle portion. The back wall may comprise a lower portion. The mounting depression may comprise an upper inclined surface. The mounting depression may comprise a lower inclined surface. The upper inclined surface and the lower inclined surface may be inclined toward one another. The mounting depression may comprise a planar surface between the upper inclined surface and the lower inclined surface. The planar surface may comprise the hanging means. The hanging means may project from the planar surface. The hanging means may comprise a projection arranged across a portion of the mounting depression. The hanging means may project above the planar surface by no more than the depth of the mounting depression. Beneficially, this means that at least a significant portion of the back wall of the wall module can sit flush against the wall structure, therefore minimising any air space between the wall structure and the wall module. Thus, the aforementioned advantages relating to the reduced volume of the void which can exist between the wall module and the face of the wall structure to which the module is secured in use, are enhanced. The hanging means may be attached to the module by at least one rib, for example one, two, three, four, five, six, seven, eight, nine or ten ribs, and preferably at least five ribs. Advantageously, the at least one rib reinforces the strength of the hanging means such that wall modules of greater mass, for example wall modules comprising a greater volume and / or mass of plants and soil, can be reliably hanged on a wall structure with a vastly reduced possibility that the hanging means will ‘giveway’ and allow the wall module to be displaced from its intended position on the wall structure in use. The back wall may comprise a second hanging means. The second hanging means may be a notch. The notch, or second hanging means, may be insertable into a corresponding feature, for example an opening, on a wall structure to which the wall module is secured when in use, or may be positioned around a protrusion, or similar, on a wall structure to which the wall module is secured when in use. Advantageously, this means that the wall module comprises a further hanging means for mating the wall module with a wall structure when in use which, therefore, increases the strength of attachment between wall module and wall structure and allows for correct alignment of the wall module and the wall structure to be more easily achieved. Thus, the wall module may be more securely hanged upon the wall structure, with the possibility of displacement, or even lateral and / or vertical movement, of the wall module further reduced when in use. The second hanging means may be comprised in an upper portion of the back wall. The second hanging means may be arranged on the back wall such that it is above the hanging means when in use. The second hanging means may provide a guiding function. The second hanging means may ensure alignment of the wall module when it is placed against a wall panel prior to being secured to the wall panel. This prevents a wall module being hanged on a wall panel by its hanging means in a non-preferable alignment or position. In use, a user may be aware that they have correctly aligned and positioned the wall module against a wall panel because, first, the wall module will be hanged on the wall panel by the hanging means, and second, because the second hanging means may be aligned with a corresponding protrusion, or similar, on the wall panel, around which is positioned the second hanging means. The second hanging means may be an upside-down ‘V’ shape. In some embodiments, the back wall may comprise an upper portion comprising a second handing means, for example in the form of at least one notch, and a middle portion comprising the hanging means. The wall module may comprise a top wall. The top wall may form an upper periphery of the wall module. The top wall may comprise a lip which may project from an outer surface of the top wall. The lip may comprise a curved base and a wall which is substantially parallel to the top wall. The lip may define a channel. The channel may run along the length of the top wall which may equate to the width of the wall module. The channel may be suitable for accommodating irrigation piping from which water can flow into the wall module when in use. The lip may comprise an inner surface which faces the outer surface of the top wall. The inner surface of the lip of the top wall, which may partly define the channel, may comprise at least one ridge. The at least one ridge may be arranged distal to the base of the channel. The inner surface of the lip of the top wall may comprise one, two, three, four, or more than four ridges. The ridges may be equidistantly spaced along the inner surface of the lip of the top wall. Beneficially, the at least one ridge may prevent, or at least substantially reduce the possibility of, the irrigation piping becoming dislodged from the channel and therefore not adequately providing water to the plants and / or soil in the wall module. The channel may comprise at least one slit. The at least one slit may be an opening to a cell of the body, preferably to an uppermost cell of the body. Advantageously, this means that irrigation piping can be laid within the channel and any water which is fed from the irrigation piping into the channel can flow through the at least one slit into the uppermost cell of the body, therefore providing water and / or nutrients to the plants and soil in the uppermost cell. In use, through the force of gravity, the water from the irrigation piping can flow downwardly, from the uppermost cell to a lower, adjacent cell, and so on, through each cell of the body, therefore providing water and / or nutrients to the plants and soil arranged in each cell. The channel may be in fluid communication with the uppermost cell of the body via the at least one slit. The wall module may comprise a bottom wall. The bottom wall may comprise at least one opening. The at least one opening may be in fluid communication with a cell of the body, preferably with a lowermost cell of the body. Advantageously, this means that water and / or nutrients which flows downwardly through the cells of the body can exit the wall module via the at least one opening. This prevents over saturation of plants and soil in the lowermost cell, and prevents the wall module holding excess water, the weight of which could cause deformation or buckling of the walls of the module. This also means that water and / or nutrients from one wall module can flow downwardly into an adjacent wall module arranged substantially below, facilitating the watering and feeding of plants and soil in the lower wall module. The first side wall may comprise at least one fixing slot for fixing the wall module to the wall structure. The second side wall may comprise at least one fixing slot for fixing the wall module to the wall structure. In some embodiments, the first side wall may comprise two fixing slots. In some embodiments, the second side wall may comprise two fixing slots. The or each fixing slot may guide a fixing component (for example, a screw) to secure a fixture between the wall module and the wall structure to which the wall module is to be secured. The or each fixing slot may be angled with respect to the back wall. In some embodiments, the or each fixing slot may be at substantially the same angle as that of the or each blade, with respect to the back wall. Advantageously, in embodiments comprising multiple fixing slots, for example four fixing slots, all fixing slots may be used to secure the wall module to a wall structure in scenarios which require the wall module to have a high wind tolerance, for example when the wall structure is, or is fixed to, a multi-story structure (e.g., a tower block), a structure in an area known for high wind speeds, or a corner section of a structure. The or each fixing slot may have an upper portion comprising a cavity. The cavity may comprise a base which comprises a central aperture. The or each fixing slot may comprise a lower portion comprising a conduit which, at its upper end, comprises the aperture, and at its lower end comprises an open end. The open end of the conduit may, in use, face a wall panel or other wall structure to which the wall module is attached. In use, to attach the wall module to a wall panel, for example, a fixing means, for example a screw, or similar, may be inserted into the aperture and passed along the conduit, out of the open end of the conduit and screwed into a corresponding aperture in the wall panel to attach the wall module to the wall panel. In embodiments comprising an upper inclined surface, at least one, for example, two, fixing slots may be arranged such that the open end of the conduit of the at least one fixing slot is arranged in the upper inclined surface of the mounting depression. The or each blade may have a height which is greater than the depth of the wall module. Thus, the or each blade may protrude above the confines of the first and second side walls of the wall module. Beneficially, this means that the blades can collect soil erosion or dust from upwardly-arranged wall modules which falls downward in use. The first side wall may comprise an outer surface. The second side wall may comprise an outer surface. The outer surface of the first side wall and / or the outer surface of the second side wall may comprise the at least one fixing slot. The first side wall may comprise at least one runner. The at least one runner may be a slit which allows for the insertion of an edge portion of a blade. The second side wall may comprise at least one runner. The at least one runner may be a slit which allows for the insertion of an edge portion of a blade. The first side wall may comprise an inner surface. The second side may comprise an inner surface. The inner surface of the first side wall and / or the inner surface of the second side wall may comprise at least one runner. The at least one runner may be angled with respect to the back wall. The first side wall and the second side wall may comprise corresponding runners, each arranged to receive a blade. Each blade may be removably inserted into a corresponding pair of runners. Each blade may comprise a plurality of apertures. Each of the plurality of apertures may be closed around its edges. Advantageously, the plurality of apertures provides for an improved flow of water through the module when in use. In this respect, the plurality of apertures provides a greater area of the blade through which water can pass through and thus flow onto plants and soil positioned below. Thus, there is provided improved drainage of water through the wall module in use and, therefore, eliminates, or at the very least, minimises, saturation of plants located closest to the source of water (e.g., in an uppermost cell) from the irrigation system and starvation of plants located furthest from the source of water (e.g., in a lowermost cell) from the irrigation system. Beneficially, the plurality of apertures provides an abundance of opportunities for plant roots to grow and entwine. In use, the plant roots grow downwardly through the apertures and entwine with adjacent plant roots. Due to the plurality of apertures, a significant number of plant roots are able to entwine, therefore, vastly increasing the structural integrity of the plant on the blade. Advantageously, each plant is, therefore, robustly held onto a blade which thus vastly decreases the possibility of the plants being dislodged or removed from their position on a blade, for example in instances of strong wind. Beneficially, a blade having a plurality of apertures, each aperture being closed around its edges, provides a stronger, more durable blade than one which comprises slits only. A blade comprising one or more slits only has one or more weak points, the weak points being located at the base of each slit which, if the blade is bent or twisted, for example during production or installation, can result in the blade being broken at the weak point. Advantageously, the plurality of apertures, each aperture being closed around its edges, provides a blade upon which a plant, or plants, can be directly positioned without the need for the plant(s) to be housed in a separate plant pot. Thus, the plants are not ‘pot bound’ and thus do not suffer from the effects of being pot bound. Moreover, the blade allows for maximum root growth space within each of the apertures and below the blade, therefore, significantly reducing root spiralling. In some embodiments, at least 90% of the total number of apertures may be hexagonal. A substantial number of the apertures may be polygons, for example over 50% of the apertures may be polygons. By this, it is meant that when a blade is viewed in plan view, each aperture is a shape with a straight-line outline. In some embodiments, all of the apertures are polygons. Beneficially, polygon apertures allow for close packing of apertures on the blade, thus maximising the possible number of apertures on each blade. Preferably, a substantial number of apertures are hexagonal, for example it is preferable that over 50% of the apertures are hexagonal, it is more preferable that over 60% of the apertures are hexagonal, it is more preferable that over 70% of the apertures are hexagonal, it is more preferable that over 80% of the apertures are hexagonal, it is even more preferable that over 90% of the apertures are hexagonal, and it is even more preferable that over 95% of the apertures are hexagonal. All of the apertures may be hexagonal. Beneficially, hexagonal apertures provide a positive aesthetic appearance and allow for close packing of apertures on the blade. Each blade may comprise at least 40, at least 60, at least 80, at least 100, at least 150, at least 200, at least 250, at least 300, at least 350, at least 400, at least 450, at least 500, at least 550, at least 600, at least 650, at least 675, or at least 690, apertures. In some embodiments, the plurality of apertures may occupy an area equal to or greater than 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 95% or 98% of the surface area of the at least one blade. Each blade may be removable from the wall module. Beneficially, this allows for different types, sizes and styles of plants to be housed within each wall module. For example, to accommodate plants which are relatively tall, or which have the potential to be relatively tall, a blade can be removed from the wall module to increase the distance between the blade on which the plant is positioned and an upwardly adjacent blade. The wall module may be formed of recycled materials. The wall module may comprise two, three, four, five, or six blades. The hanging means may comprise a lower surface. The lower surface may be angled at approximately 45° to 90° relative to the planar surface of the mounting depression. The lower surface may facilitate the placing of a correspondingly shaped article below, to therefore support the wall module. In some embodiments, the wall module may comprise more than one notch. For example, the wall module may comprise two, three, four, or more notches. In such embodiments, the notches may be orderly arranged on the back wall of the wall module. In embodiments comprising more than one notch, for example two or four notches, the wall module may be able to support loads of increased weight, therefore providing a more secure and reliable Living Wall system. In embodiments comprising two notches, a first notch may be arranged on an upper portion of the back wall, and a second notch may be arranged on a lower portion of the back wall. Each notch may be arranged approximately equidistance from either side wall. Alternatively, in embodiments comprising two notches, both notches may be arranged on an upper portion of the back wall. The or each notch may comprise a lower edge which is parallel, or at least substantially parallel, to the hanging means. In embodiments comprising four notches, a first notch and a second notch may be arranged on an upper portion of the back wall, and a third notch and a fourth notch may be arranged on a lower portion of the back wall. The first and third notches may be arranged approximately equidistance from the first side wall. The second and fourth notches may be arranged approximately equidistance from the second side wall. According to a broad second aspect of the invention, there is provided a wall panel. The wall panel may be for forming a wall structure. The wall panel may comprise an outer facing surface. The wall panel may comprise an inner facing surface. The outer facing surface may comprise at least one supporting means. The at least one supporting means may be arranged across the outer facing surface, or across a portion of the outer facing surface. The outer facing surface may comprise at least one protrusion. The at least one protrusion may be arranged to protrude above the plane of the outer facing surface. According to a second aspect of the invention, there is provided a wall panel for forming a wall structure, the wall panel comprising an outer facing surface and an inner facing surface, the outer facing surface comprising at least one supporting means arranged across a portion of the outer facing surface, the outer facing surface further comprising at least one protrusion arranged to protrude above the plane of the outer facing surface. Advantageously, the wall panel provides at least one supporting means upon which can be supported, or hanged, a hanging means, for example the hanging means of the wall module of the first aspect. Further advantageously, the wall panel comprises at least one protrusion which can accept a corresponding orifice, or similar, comprised in a wall module. Thus, the at least one protrusion provides a further means for supporting a wall module in use. The at least one protrusion may provide a guiding function. The at least one protrusion may ensure alignment of a wall module when it is placed against the wall panel prior to being secured to the wall panel. This prevents a wall module being hanged or supported on the wall panel in a non-preferable alignment or position. In use, a user may be aware that they have correctly aligned and positioned a wall module against the wall panel because, first, the wall module will be supported on the wall panel by the supporting means, and second, because the at least one protrusion may be inserted into a corresponding recess or notch on the wall module. The supporting means and at least one protrusion provide a dual-strength effect when supporting a wall module, therefore allowing additional strength in vertical applications of the invention. Beneficially, the wall panel provides a means for forming a wall structure, formed from one or more wall panels, to which one or more wall modules according to the first aspect may be secured in use. The wall panel provides for a more reliable wall structure than wall structures typically used in the art as part of Living Wall systems, for example wall structures formed of standard scaffolding or French cleats. The wall panel provides complimentary supporting means to the hanging means and, where present in some embodiments, the notch, of the wall module. The wall panel may comprise a top edge and a bottom edge. The top edge and bottom edge may be substantially parallel to one another. The wall panel may comprise a first protrusion and a second protrusion. The first protrusion may be arranged between the at least one supporting means and the top edge of the wall panel. The second protrusion may be arranged between the at least one supporting means and the bottom edge of the wall panel. The wall panel may comprise two or more protrusions arranged between the at least one supporting means and the top edge of the wall panel. The wall panel may comprise two or more protrusions arranged between the at least one supporting means and the bottom edge of the wall panel. The protrusions arranged between the at least one supporting means and the top edge of the wall panel may be arranged substantially adjacent one another. The protrusions arranged between the at least one supporting means and the bottom edge of the wall panel may be arranged substantially adjacent one another. The wall panel may comprise a first side portion. The wall panel may comprise a second side portion. The first side portion and / or the second side portion may comprise at least one aperture for receiving a fixing means. The at least one aperture may be arranged to be aligned with a corresponding fixing slot of the wall module. To install a Living Wall system, in some embodiments, the wall module may be placed upon the wall panel such that a fixing slot of the wall module aligns with an aperture of the wall panel. A fixing means, for example a screw, may then be inserted through the fixing slot of the wall module and through the aperture of the wall panel to affix the wall module to the wall panel. The or each side portion may have a variable width. The first side portion may extend inwardly from a periphery of a first side of the wall panel a distance of no more than 5%, 10%, 12.5%, 15%, 17.5%, 20%, 22.5%, 25%, 27.5%, or 30%, of the width of the wall panel. The second side portion may extend inwardly from a periphery of a second side of the wall panel a distance of no more than 5%, 10%, 12.5%, 15%, 17.5%, 20%, 22.5%, 25%, 27.5%, or 30%, of the width of the wall panel. Each side portion may comprise one or more cut-out portions. The one or more cut-out portions may facilitate the interlocking of adjacent wall panels in use, for example when forming a wall structure comprising more than one wall panel. The wall panel may comprise a central portion. The central portion may be the portion of the wall panel between the first side portion and the second side portion. The central portion may comprise the at least one supporting means. The outer facing surface of the wall panel may be planar, or at least substantially planar, save for the supporting means and the at least one protrusion. The outer facing surface of the wall panel may be planar, or at least substantially planar, save for the supporting means, the at least one protrusion and the first side portion. The outer facing surface of the wall panel may be planar, or at least substantially planar, save for the supporting means, the at least one protrusion and the second side portion. The wall panel may comprise more than one protrusion. The wall panel may comprise two, three, four, five, or six protrusions. In some embodiments, the wall panel may comprise two protrusions arranged above the at least one supporting means, that is to say, above the at least one supporting means across the plane of the outer facing surface of the wall panel. In some embodiments, the wall panel may comprise two protrusions arranged below the at least one supporting means, that is to say, below the at least one supporting means across the plane of the outer facing surface of the wall panel. In embodiments comprising more than one protrusion, the secure attachment of a wall module to the wall panel is enhanced, and the wall module is able to support considerably heavier loads. The outer facing surface of the wall panel may comprise four similarly sized quadrants arranged as an upper left quadrant, upper right quadrant, lower left quadrant and lower right quadrant. In embodiments comprising more than one protrusion, the outer facing surface of the wall panel may comprise a protrusion in each of the four quadrants. The first side portion may be depressed relative to the central portion. The second side portion may be depressed relative to the central portion. Advantageously, in embodiments comprising a first side portion which is depressed relative to the central portion, the first side portion may interlock with a side portion of a second wall panel which is not depressed relative to a central portion of the second wall panel. Such an interlocking mechanism occurs by aligning the aforementioned side portion of the second wall panel above the first side portion of the wall panel, and fitting the side portion of the second wall panel to the first side portion of the wall panel. Thus, a planar surface may be formed across adjacent side portions of two wall panels. The first side portion and / or the second side portion may be planar, or at least substantially planar. The first side portion and / or the second side portion may be planar with the central portion. The wall panel may comprise more than one central portion. Each central portion may comprise a corresponding first side portion and second side portion. Advantageously, this means that a wall panel may be used to support more than one wall module. For example, a single wall panel may comprise three central portions and three corresponding first and second side portions. Each central portion may comprise at least one supporting means and at least one protrusion. Thus, the wall panel may support three wall modules. The wall panel may comprise two central portions and three side portions. The wall panel may comprise three central portions and four side portions. The wall panel may comprise four central portions and five side portions. The wall panel may comprise five central portions and six side portions. The at least one supporting means may be arranged to support the hanging means of the wall module according to the first aspect. The wall panel, preferably the or each side portion, may comprise at least one channel. The at least one channel may extend from the outer facing surface to the inner facing surface such that the channel is a through passage between the outer facing surface and the inner facing surface. The at least one channel may extend from the outer facing surface toward the inner facing surface but not to the inner facing surface. In use, the at least one channel may receive a securing means for securing a wall module, for example a wall module according to the first aspect, to the wall panel. In use, the securing means may extend through or from a wall module, for example a wall module according to the first aspect, and into the at least one channel. The securing means may then attach directly to the wall panel or attach to a recipient item located behind the wall panel, i.e., facing the inner facing surface of the wall panel. Each wall panel may comprise more than one channel. For example, each wall panel may comprise one, two, three, four, five, six, seven, eight, nine, or ten channels. The channels may be equally spaced along the or each side portion of the wall panel. The at least one supporting means may be at least one continuous supporting means across a portion of the outer facing surface of the wall panel. The at least one supporting means may extend horizontal across a portion of the outer facing surface of the wall panel when in use. The at least one supporting means may comprise a supporting surface perpendicular, or at least substantially perpendicular, to the outer facing surface The at least one supporting means may comprise a supporting surface, or upwardly facing surface, which extends from the outer facing surface at an angle of between 45° and 90°, preferably at an angle of between 45° and 70°. In use, according to a particular embodiment, the lower surface of the hanging means of a wall module may abut an upwardly facing surface of the supporting means. The mounting depression of the wall module may provide an adequate void for the supporting means to be inserted into, allowing the aforementioned interaction between the lower surface of the hanging means and the upwardly facing surface of the supporting means. Thus, the wall module is supported by the wall panel. Advantageously, this allows the wall module to sit flush against the outer facing surface of the wall panel, save for the mounting depression of the wall module. Thus, any air space between the wall structure and the wall module is minimised. Thus, the aforementioned advantages relating to the reduced volume of the void which can exist between the wall module and the face of the wall structure to which the module is secured in use, are further enhanced. The at least one supporting means may comprise at least one rib. The at least one rib may extend from the outer facing surface to an underside of the supporting surface of the at least one supporting means. Beneficially, the at least one rib increases the strength of the at least one supporting means such that the supporting means is able to support greater weights. The at least one supporting means may be two supporting means arranged next to one another. The two supporting means may be substantially identical. In use, the supporting surface may support a hanging means, for example a hanging means of a wall module according to the first aspect. The wall panel may be used to support a wall module according to the first aspect. The at least one protrusion may protrude above the plane of the outer facing surface by a distance no greater than that of the at least one supporting means. In use, the wall panel may interact with a wall module, for example a wall module according to the first aspect, by the hanging means of the wall module interacting with the supporting means of the wall panel, and in some embodiments by the at least one protrusion being inserted into a notch of the wall module. The interaction between the hanging means and the supporting means, and, in some embodiments, between the at least one protrusion and the notch, provide for secure and reliable attachment of the wall module to the wall panel. Moreover, such interacting features act as alignment points which ensure fast and accurate installation of a Living Wall system. The inner facing surface of the wall panel may comprise one or more ribs. Advantageously, the one or more ribs enhance the structural integrity and load-bearing capacity of the wall panel. Moreover, the one or more ribs means that the wall panel may be cut in designated vertical or horizontal positions and / or segments such that the wall panel is cut to smaller sizes without compromising the structural integrity and loadbearing capacity of the wall panel. The one or more ribs may be a grid or network or ribs. The ribs may extend in either, or both, of a vertical and a horizontal direction across the inner facing surface of the wall panel. The inner facing surface of the wall panel may comprise a pair of parallel ribs. The pair of parallel ribs may be arranged vertically from a top edge to a bottom edge of the wall panel. The inner facing surface of the wall panel may comprise a grid of ribs substantially paralleling the outline of the at least one supporting means. According to a third aspect of the invention, there is provided a wall structure. The wall structure may comprise a plurality of wall panels according to the second aspect. The wall structure may comprise adjacent wall panels. The adjacent wall panels may be connected to one another by the connection of adjacent depressed and planar side portions. According to a fourth aspect of the invention, there is provided a living wall system. The living wall system may comprise at least one wall panel according to the second aspect of the invention. The living wall system may comprise at least one wall module according to the first aspect of the invention. The at least one wall module may be supported on the at least one wall panel by engagement between corresponding supporting means of the at least one wall panel and hanging means of the at least one wall module. According to a fifth aspect of the invention, there is provided a kit of parts for a living wall system, comprising a wall module according to the first aspect and a wall panel according to the second aspect. The kit of parts may include therein a wall module having any of the features, optional or otherwise, of the first aspect of the invention, and a wall panel having any of the features, optional or otherwise, of the second aspect of the invention. The invention according to any aspect may include any feature, optional or otherwise, of the invention according to any other aspect. Detailed Description of the Invention In order that the invention may be more clearly understood one or more embodiments thereof will now be described, by way of example only, with reference to the accompanying drawings, of which: Figure 1 is a perspective view of a wall module according to an embodiment of an aspect of the invention; Figure la is an enlarged view of a fixing slot of the wall module of Figure 1; Figure 2 is a plan view of the wall module of Figure 1; Figure 3 is a left side view of the wall module of Figure 1; Figure 4 is a right side view of the wall module of Figure 1; Figure 5 is an underside view of the wall module of Figure 1; Figure 6 is a front view of the wall module of Figure 1; Figure 7 is a back view of the wall module of Figure 1; Figure 8 is a perspective view of the wall module of Figure 1 with some features omitted; Figure 9 is a plan view of the wall module of Figure 8; Figure 10 is a perspective view of a blade of the embodiment shown in Figure 1; Figure 11 is a perspective view of a wall structure according to an embodiment of a further aspect of the invention; Figure 12 is a plan view of the wall structure of Figure 11; Figure 13 is a left side view of the wall structure of Figure 11; Figure 14 is a rear view of the wall structure of Figure 11; Figure 15 is a perspective view of a Living Wall system according to an embodiment of a further aspect of the invention; Figure 16 is a plan view of the Living Wall system of Figure 15; Figure 17 is a left side view of the Living Wall system of Figure 15; Figure 18 Figure 19 Figure 20 Figure 20a Figure 21 Figure 22 Figure 23 Figure 24 Figure 25 Figure 26 Figure 27 Figure 28 Figure 29 Figure 30 Figure 31 Figure 32 Figure 33 Figure 34 Figure 35 is a perspective view of a wall module according to a further embodiment of an aspect of the invention with some features omitted; is a plan view of the wall module of Figure 18; is an underside view of the wall module of Figure 18; is a right side view of the wall module of Figure 18; is a perspective view of a wall structure according to a further embodiment of an aspect of the invention; is a plan view of the wall structure of Figure 21; is a left side view of the wall structure of Figure 21; is a rear view of the wall structure of Figure 21; is a plan view of the wall structure of Figure 21 according to an alternate arrangement; is a perspective view of a Living Wall system according to a further embodiment of an aspect of the invention; is a plan view of the Living Wall system of Figure 26; is a perspective view of a wall module according to a further embodiment of an aspect of the invention with some features omitted; is a plan view of the wall module of Figure 28; is an underside view of the wall module of Figure 28; is a perspective view of a Living Wall system according to a further embodiment of an aspect of the invention; is a plan view of the Living Wall system of Figure 31; is a perspective view of a wall module according to a further embodiment of an aspect of the invention with some features omitted; is a plan view of the wall module of Figure 33; is an underside view of the wall module of Figure 33; Figure 36 is a left side view of the wall module of Figure 33; Figure 37 is a perspective view of a Living Wall system according to a further embodiment of an aspect of the invention; Figure 38 is a plan view of the Living Wall system of Figure 37; Figure 39 is a right side view of the Living Wall system of Figure 37; Figure 40 is a perspective view of a Living Wall system according to a further embodiment of an aspect of the invention; and Figure 41 is a plan view of the Living Wall system of Figure 40. With reference to Figures 1 to 9, there is shown a wall module 1 for use in a Living Wall system. In use, the wall module 1 may be occupied by soil and plants. The module 1 may comprise a body 2. The body 2 may be substantially rectangular and may be a moulding of a plastics material, preferably a recyclable plastics material. The body 2 may comprise a back wall 3, a first side wall 4, a second side wall 5, a top wall 16 and a bottom wall 19. The body 2 may comprise a plurality of cells 6. The cells 6 may be in a vertical arrangement, when in use, such that there is an uppermost cell 6a and a lowermost cell 6f (see Fig. 15). In the described embodiment, the body comprises six cells. Adjacent cells 6 are separated from one another by a blade 7. The uppermost cell 6a is bordered by the top wall 16 at its upper edge, by a blade 7 at its lower edge, and by a portion of the first side wall 4 and a portion of the second side wall 5 at its side edges. The lowermost cell 6f is bordered by a blade 7 at its upper edge, by the bottom wall 19 at its lower edge, and by a portion of the first side wall 4 and a portion of the second side wall 5 at its side edges. Each cell 6 arranged between the uppermost cell 6a and the lowermost cell 6f is bordered by a blade 7 at its upper and lower edges, and by a portion of the first side wall 4 and a portion of the second side wall 5 at its side edges. The top wall 16 may form an upper periphery of the wall module 1. In the embodiment shown, the top wall 16 may comprise a lip 16a which defines a channel 17. The channel 17 may run along the length of the top wall 16 which may equate to the width of the wall module 1. The channel 17 may be suitable for accommodating irrigation piping (not shown) from which water can flow into the wall module 1 when in use. The inner surface of the lip 16a of the top wall 16, which partly defines the channel 17, may comprise at least one ridge 16b arranged distal to a base of the channel 17. Beneficially, the at least one ridge 16b may prevent, or at least substantially reduce the possibility of, the irrigation piping becoming dislodged from the channel 17 and therefore not adequately providing water to the plants and / or soil in the wall module 1. In the embodiment shown, the inner surface of the lip 16a comprises three ridges, equidistantly spaced along the inner surface of the lip 16a. The channel 17 may comprise at least one slit 18. As shown in Figure 9, in the embodiment shown, the channel 17 comprises four slits 18. Each slit 18 may be an opening to the uppermost cell 6a of the body 2, such that the channel 17 is in fluid communication with the uppermost cell 6a of the body 2 via each slit 18. Advantageously, this means that irrigation piping can be laid within the channel 17 and any water which is fed from the irrigation piping into the channel 17 can flow through the slits 18 into the uppermost cell 6a of the body 2, therefore providing water and / or nutrients to the plants and soil in the uppermost cell 6a. In use, through the force of gravity, the water from the irrigation piping flows downwardly, from the uppermost cell 6a to a lower, adjacent cell 6, and so on, through each cell 6 of the body 2, toward and into the lowermost cell 6f of the body 2, therefore providing water and / or nutrients to the plants and soil arranged in each cell 6. The bottom wall 19 may form a lower periphery of the wall module 1. The bottom wall 19 may comprise a first wall 19a angled with respect to the back wall 3, and a second wall 19b which is substantially planar with the back wall 3 and, therefore, angled with respect to the first wall 19a. In the embodiment shown, the bottom wall 19, specifically the first wall 19a of the bottom wall 19, comprises four openings 20. Each of the four openings 20 may be in fluid communication with the lowermost cell 6f of the body 2. Advantageously, this means that water and / or nutrients which flows downwardly through the cells 6 of the body 2 can exit the wall module 1 via each opening 20. This prevents over saturation of plants and soil in the lowermost cell 6f, and prevents the wall module 1 holding excess water, the weight of which could cause deformation or buckling of the walls of the module 1, in particular the bottom wall 19 and side walls 4, 5. This also means that, when arranged in a Living Wall system, water and / or nutrients from a first wall module 1 can flow downwardly into a second wall module arranged substantially below the first wall module 1, therefore facilitating the watering and feeding of plants and soil in the lower wall module. The first side wall 4 may join the top wall 16 and the bottom wall 19 along an edge of the body 2. The first side wall 4 may comprise an outer surface 4a and an inner surface 4b. The inner surface 4b may face an inner surface 5b of the second side wall 5. The outer surface 4a of the first side wall 4 may comprise two fixing slots 21 for fixing the wall module 1 to a wall structure, for example to a wall panel. The first side wall 4 is substantially straight, save for each fixing slot 21 which may indent inwardly into the body 2, toward the second side wall 5, as shown in Fig. 2. Each fixing slot 21 has a length slightly greater than the depth of the wall module 1. Each fixing slot 21 is approximately parallel with the top wall 16 and is therefore angled with respect to the back wall 3. Each fixing slot 21 may have an upper portion comprising a cavity 43. The cavity 43 may comprise a base 44 which comprises a central aperture 45. Each fixing slot 21 may comprise a lower portion comprising a conduit 46 which, at its upper end, comprises the aperture 45, and at its lower end, comprises an open end 47. The open end 47 of the conduit 46 may, in use, face a wall panel or other wall structure to which the wall module 1 is attached. In use, to attach the wall module to a wall panel, for example, a fixing means, for example a screw, or similar, is inserted into the aperture 45 and passes along the conduit 46 and is screwed into a corresponding aperture in the wall panel to attach the wall module 1 to the wall panel. The second side wall 5 may join the top wall 16 and the bottom wall 19 along an edge of the body 2. The second side wall 5 may comprise an outer surface 5 a and the inner surface 5b. The inner surface 5b may face the inner surface 4b of the first side wall 4. The outer surface 5 a of the second side wall 5 may comprise two fixing slots 21 for fixing the wall module 1 to a wall structure, for example to a wall panel. The second side wall 5 is substantially straight, save for each fixing slot 21 which may indent inwardly into the body 2, toward the first side wall 4, as shown in Fig. 2. Each fixing slot 21 has a length slightly greater than the depth of the wall module 1. Each fixing slot 21 is approximately parallel with the top wall 16 and is therefore angled with respect to the back wall 3. Each fixing slot 21 may be substantially similar to each fixing slot comprised on the first side wall 4, i.e., comprising a cavity 43, base 44, central aperture 45 and a conduit 46. The fixing slots 21 of the first side wall 4 may be arranged diametrically opposite the fixing slots 21 of the second side wall 5, such that the four fixing slots 21 comprise two pairs of diametrically opposed fixing slots 21. A first pair of fixing slots 21 may be arranged in the cell 6 above the lowermost cell 6f, and a second pair of fixing slots 21 may be arranged in the cell 6 below the uppermost cell 6a. The back wall 3 may be joined to the top wall 16, first side wall 4, bottom wall 19 and second side wall 5 about its periphery. As shown in Fig. 5, the back wall 3 may have a substantially rectangular outline. The back wall 3 may comprise an upper portion 15a, a middle portion 15b and a lower portion 15c. Each portion 15a, 15b, 15c may be approximately the same length and width. The upper portion 15a may comprise a notch 14. In the embodiment shown, the notch 14 is a cut-out in the back wall 3 such that the notch forms an internal cavity in the back wall 3. The notch 14 comprises a partial square shape, in which an upper side of the square is replaced with two lines extending toward the top wall 16 and meeting at a mid-way point. A lower edge 14a of the notch 14 is sloped inwardly, such that there is a slope from the back wall 3, specifically from the upper portion 15a of the back wall 3, into the notch 14. The middle portion 15b of the back wall 3 and the lower portion 15c of the back wall 3 may each comprise the open end 47 of the conduits 46 of a pair of fixing slots 21. The middle portion 15b of the back wall comprises a mounting depression 8. The mounting depression 8 comprises an upper inclined surface 10 and a lower inclined surface 11, each inclined surface 11, 12 being inclined into the back wall 3 to create a depression in the back wall 3. The upper inclined surface 10 and the lower inclined surface 11 are joined by a substantially planar surface 12. The substantially planar surface 12 is therefore depressed into the back wall 3. A plurality of ribs 13 may project outwardly from across part of the upper inclined surface 10 and part of the planar surface 12. In the embodiment shown, there may be seven ribs 13. The ribs 13 may be joined across their outermost ends to form a hanging means 9. The hanging means 9 may comprise a lower surface 9a which is angled at approximately 60° relative to the planar surface 12 such that it facilitates the placing of a correspondingly shaped article below, to therefore support the wall module 1. In the embodiment shown, the inner surface 4b of the first side wall 4 and the inner surface 5b of the second side wall 5 may comprise diametrically opposed runners 22. Each diametrically opposed pair of runners 22 may be angled with respect to the back wall 3, and may be angled such that they are substantially parallel with the back wall 16. With reference to Figure 10, each runner 22 may comprise a slot into which an edge 36 of a blade 7 may be reversibly inserted such that the blade 7 may be held, temporarily, within each runner 22. Each blade 7 comprises a rectangular planar surface 37 having a plurality of apertures 23. In the embodiment shown, there may be approximately 400 apertures 23 in the blade 7. The apertures 23 may be equally distributed across the planar surface 37 save for relatively narrow peripheral portions of the planar surface 37. Each blade 7 may comprise an upper edge portion 36a and a pair of edge portions 36, each of which project above and below the planar surface 37. Each edge portion 36 comprises a clip 35. When a blade 7 is inserted into diametrically opposed runners 22 of the wall module 1, the clips 35 on each edge portion 36 interact with an upper portion of each runner 22 to create a friction-fit between the clip 35 and the runner 22, therefore, holding the blade 7 in its place in the wall module 1. To remove a blade 7 from the wall module, a user merely needs to provide enough force to pull the blade 7 out from the runners 22 in which it is inserted, overcoming the friction-fit force applied by the clips 35 on the runners 22. Alternatively, a user may slightly bias the clips 35 away from the runners 22, overcoming the friction-fit force applied by the clips 35 on the runners 22, and lift the blade 7 out of the runners 22. With reference to Figures 11 to 14, there is shown a wall structure 33. In the embodiment shown, the wall structure 33 comprises three wall panels 24a, 24b, 24c. Each wall panel 24 comprises an outer facing surface 25 and an inner facing surface 26. In use, the inner facing surface 26 may face a building (not shown) or other structure to which the wall structure 33 is to be fitted. The outer facing surface 25 of each wall panel 24 may comprise an upper portion 29a, a middle portion 29b and a lower portion 29c. In the embodiment shown, the upper portion 29a of each wall panel 24 comprises a protrusion 28. Each protrusion 28 projects from the outer facing surface 25 of each wall panel 24 by a distance of approximately 3cm. The shape of each protrusion 28 is similar to that of an upwardly facing arrow-head and corresponds to the internal cavity in the back wall 3 formed by the notch 14 of the wall module 1. In the embodiment shown, the middle portion 29b of each wall panel 24 comprises a pair of supporting means 27. Each supporting means 27 comprises a cutout section of the wall panel 24, the cut-out section being extended outwardly, away from the outer facing surface 25 of the wall panel, at an angle of between 45° and 90°, exemplified in the shown embodiment at about 55°, to form an upwardly facing surface 27a. Each supporting means 27 may be arranged horizontally on the outer facing surface 25, therefore ensuring horizontal alignment of a wall module 1 when, in use, it is supported, through interaction of the supporting means 27 and hanging means 9, on the wall panel 24. In the described embodiment, each supporting means 27 comprises three, equidistantly spaced ribs 38. Each rib 38 projects from a portion of the outer facing surface 25 proximal to the upwardly facing surface 27a, and joins to an underside of the upwardly facing surface 27a. The substantially planar outer facing surface 25, save for the supporting means 27 and the protrusion 28, allows for a wall module 1 to sit flush against the wall panel 24 when in use. In use, the lower surface 9a of the hanging means 9 of a wall module 1 abuts an upwardly facing surface 27 a of the supporting means 27. The mounting depression 8 of the wall module 1 provides an adequate void for the supporting means 27 to be inserted into, allowing the aforementioned interaction between the lower surface 9a of the hanging means 9 and the upwardly facing surface 27a of the supporting means 27. Thus, the wall module 1 is supported by the wall panel 24. Further support is provided by the interaction of the protrusion 28 of the wall panel 24 and the notch 14 of the wall module 1. In use, the notch 14 is overlaid on the protrusion 28 such that the protrusion 28 has been inserted into the notch 14. The protrusion 28 and notch 14 may be correspondingly shaped so as to allow a good fit of the protrusion 28 within the notch 14. The interaction between the notch 14 and protrusion 28 provides further support for the wall module 1 upon the wall panel 24. The substantially planar back wall 3 of the wall module 1 save for the mounting depression 8, and the substantially planar wall panel 24, save for the supporting means 27 and protrusion 28, means that the back wall 3 is flush against the outer facing surface 25 except for the lower inclined surface 11 and a portion of the planar surface 12 of the mounting depression 8, as shown in Fig. 17. The advantages of such an arrangement are stated in the corresponding statements of the invention. Each wall panel 24 may comprise a first side portion 30 and a second side portion 31. For example, as shown in the described embodiment, wall panel 24a comprise first side portion 30a and second side portion 31a. First side portion 30a is depressed relative to the outer facing surface 25a, save for a pair of apertures 39a and their proximally surrounding surface, which is planar with the outer facing surface 25a. The first side portion 30a may comprise six channels 32a. Each channel 32a provides a through passage between the outer facing surface 25a and the inner facing surface 26a. In use, when fixing the wall panel 24a to a building or other structure (not shown), a securing means for securing a wall module 1 to the wall panel 24a may be inserted into one or more channels 32a to secure the wall module 1 to the wall panel 24a. Alternatively, a securing means may be passed through one or more channels 32a to secure the wall panel 24a to a building or other structure (not shown). The first side portion 30a comprises two cut out portions 50a arranged adjacent to the middle portion 29b of the outer facing surface 25a and adjacent to the lower portion 29c of the outer facing surface 25a. The size and shape of each cut out portion 50a corresponds to an extended portion 49a comprised in the second side portion 31a arranged diametrically opposite the cut out portions 50a of the first side portion 30a. The second side portion 31a may comprise an aperture 39a in each of its extended portions. Each aperture 39a comprised in each of the first side portion 30a and the second side portion 31a may be for receiving a fixing means which has been inserted through a fixing slot 21 of the wall module 1 and then through one of the apertures 39a of the wall panel 24a to affix the wall module 1 to the wall panel 24a. The second side portion 31a is planar with respect to the outer facing surface 25 a, and is therefore raised relative to the first side portion 30a. As shown in the described embodiment, wall panel 24b is attached to wall panel 24a. Wall panel 24b is substantially similar to wall panel 24a. Wall panel 24b comprises first side portion 30b and second side portion 31b. First side portion 30b is depressed relative to the outer facing surface 25b, save for a pair of apertures 39b and their proximally surrounding surface, which is planar with the outer facing surface 25b. The first side portion 30b may comprise six channels 32b. Each channel 32b provides a through passage between the outer facing surface 25b and the inner facing surface 26b. In use, when fixing the wall panel 24b to a building or other structure (not shown), a securing means for securing a wall module to the wall panel 24b may be inserted into one or more channels 32b to secure the wall module to the wall panel 24b. Alternatively, a securing means may be passed through one or more channels 32b to secure the wall panel 24b to a building or other structure (not shown). The first side portion 30b comprises two cut out portions 50b, as also found in wall panel 24a. The size and shape of each cut out portion 50b corresponds to an extended portion 49b comprised in the second side portion 31b arranged diametrically opposite the cut out portions 50b of the first side portion 30b. The second side portion 31b may comprise an aperture 39b in each of its extended portions 49b. Each aperture 39b comprised in each of the first side portion 30b and the second side portion 3 lb may be for receiving a fixing means which has been inserted through a fixing slot 21 of the wall module and then through one of the apertures 39b of the wall panel 24b to affix the wall module to the wall panel 24b. The second side portion 31b is planar with respect to the outer facing surface 25b, and is therefore raised relative to the first side portion 30b. In forming a wall structure 33, wall panel 24a is affixed to wall panel 24b by first overlaying an outer peripheral part of the second side portion 31a, including an outer peripheral part of each extended portion 49a of wall panel 24a with an outer peripheral part, including outer peripheral part of cut out portions 50b, of the first side portion 30b of wall panel 24b. Through a clip-fit mechanism, second side portion 31a of wall panel 24a may be ‘clipped’ onto first side portion 30b of wall panel 24b to form a join 48ab. Wall panel 24c differs from wall panels 24a, 24b in that its second side portion 31c does not comprise any extended portions (c.f., extended portions 49a of wall panel 24a and extended portions 49b of wall panel 24b). Instead, wall panel 24c comprises a first side portion 30c comprising cut out portions 50c, and a second side portion 31c comprising cut out portions 51c. On the inner facing surface 26 of each wall panel 24, there may be provided a series of ribs. The inner facing surface of wall panel 24a comprises ribs 40. The inner facing surface of wall panel 24b comprises ribs 41. The inner facing surface of wall panel 24c comprises ribs 42. Ribs 40, 41, 42 each comprise a pair of centrally aligned ribs which run down a central portion of the inner facing surface 26 of each wall panel 24a, 24b, 24c, respectively. Each pair of ribs 40, 41, 42 may be a pair of parallel ribs. The pair of parallel ribs 40, 41, 42 may be arranged vertically from a top edge to a bottom edge of the respective wall panel 24a, 24b, 24c. In forming the wall structure 33, wall panel 24b is affixed to wall panel 24c by first overlaying an outer peripheral part of the second side portion 31b, including an outer peripheral part of each extended portion 49b of wall panel 24b with an outer peripheral part, including outer peripheral part of cut out portions 50c, of the first side portion 30c of wall panel 24c. Through a clip-fit mechanism, second side portion 31b of wall panel 24b may be ‘clipped’ onto first side portion 30c of wall panel 24c to form a join 48bc. Thus forming a wall structure 33 comprising wall panels 24a, 24b and 24c. A living wall system 34 is formed once wall modules 1 are secured to each wall panel 24 of the wall structure 33, as described above. The advantages of such a living wall system 34 are described in relation to the statements of invention. Figures 18-20 show a wall module 101 according to a further embodiment of an aspect of the invention. For ease of illustration, blades have been omitted from figures 18-20. However, it will be readily understood that, in use, corresponding blades will be inserted into diametrically opposed pair of runners 2201, as in the previously described embodiment of wall module 1. The blades used with the wall module 101 shown in figures 18-20 may be the same as those described in relation to the wall module 1. Wall module 101 comprise much the same features as that of wall module 1. The module 101 may comprise a body 201. The body 201 may be substantially rectangular and may be a moulding of a plastics material, preferably a recyclable plastics material. The body 201 may comprise a back wall 301, a first side wall 401, a second side wall 501, a top wall 1601 and a bottom wall 1901. The body 201 may comprise a plurality of cells 601. The cells 601 may be in a vertical arrangement, when in use, such that there is an uppermost cell and a lowermost cell (as in wall module 1). In the described embodiment, the body 201 comprises six cells 601. Adjacent cells 601 are separated from one another by a blade (not shown). The uppermost cell is to be bordered by the top wall 1601 at its upper edge, by a blade at its lower edge, and by a portion of the first side wall 401 and a portion of the second side wall 501 at its side edges. The lowermost cell is bordered by a blade (not shown) at its upper edge, by the bottom wall 1901 at its lower edge, and by a portion of the first side wall 401 and a portion of the second side wall 501 at its side edges. Each cell 601 arranged between the uppermost cell and the lowermost cell is bordered by a blade (not shown) at its upper and lower edges, and by a portion of the first side wall 401 and a portion of the second side wall 501 at its side edges. The top wall 1601 may form an upper periphery of the wall module 101. In the embodiment shown, the top wall 1601 may comprise a lip 16a01 which defines a channel 1701. The channel 1701 may run along the length of the top wall 1601 which may equate to the width of the wall module 101. The channel 1701 may be suitable for accommodating irrigation piping (not shown) from which water can flow into the wall module 101 when in use. The inner surface of the lip 16a01 of the top wall 1601, which partly defines the channel 1701, may comprise at least one ridge 16b01 arranged distal to a base of the channel 1701. Beneficially, the at least one ridge 16b01 may prevent, or at least substantially reduce the possibility of, the irrigation piping becoming dislodged from the channel 1701 and therefore not adequately providing water to the plants and / or soil in the wall module 1. In the embodiment shown, the inner surface of the lip 16a01 comprises three ridges, equidistantly spaced along the inner surface of the lip 16a01. The channel 1701 may comprise at least one slit (not shown). The, or each, slit is to be understood as largely similar to the slit described in relation to wall module 1, and have the same function with respect to allowing water and / or nutrients to be fed to the plants and soil in each cell in use. The bottom wall 1901 may form a lower periphery of the wall module 101. The bottom wall 1901 may comprise a first wall 19a01 angled with respect to the back wall 301, and a second wall 19b01 which is substantially planar with the back wall 301 and, therefore, angled with respect to the first wall 19a01. In the embodiment shown, the bottom wall 1901, specifically the first wall 19a01 of the bottom wall 1901, comprises four openings 2001. Each of the four openings 2001 may be in fluid communication with the lowermost cell of the body 201. Advantageously, this means that water and / or nutrients which flows downwardly through the cells 601 of the body 201 can exit the wall module 101 via each opening 2001. This prevents over saturation of plants and soil in the lowermost cell, and prevents the wall module 101 holding excess water, the weight of which could cause deformation or buckling of the walls of the module 101, in particular the bottom wall 1901 and side walls 401, 501. This also means that, when arranged in a Living Wall system, water and / or nutrients from a first wall module 101 can flow downwardly into a second wall module arranged substantially below the first wall module 101, therefore facilitating the watering and feeding of plants and soil in the lower wall module. The first side wall 401 may join the top wall 1601 and the bottom wall 1901 along an edge of the body 201. The first side wall 401 may comprise an outer surface 4a01 and an inner surface 4b01. The inner surface 4b01 may face an inner surface 5b01 of the second side wall 501. The outer surface 4a01 of the first side wall 401 may comprise two fixing slots 2101 for fixing the wall module 101 to a wall structure, for example to a wall panel. The first side wall 401 is substantially straight, save for each fixing slot 2101 which may indent inwardly into the body 201, toward the second side wall 501. Each fixing slot 2101 has a length slightly greater than the depth of the wall module 101. Each fixing slot 2101 is approximately parallel with the top wall 1601 and is therefore angled with respect to the back wall 301. Each fixing slot 2101 may be of the same form as the fixing slots 21 shown in relation to wall module 1 and, therefore, attach the wall module 101 to a corresponding wall panel in the same way as that described in relation to wall module 1. The second side wall 501 may join the top wall 1601 and the bottom wall 1901 along an edge of the body 201. The second side wall 501 may comprise an outer surface 5a01 and the inner surface 5b01. The inner surface 5b01 may face the inner surface 4b01 of the first side wall 401. The outer surface 5a01 of the second side wall 501 may comprise two fixing slots 2101 for fixing the wall module 101 to a wall structure, for example to a wall panel. The second side wall 501 is substantially straight, save for each fixing slot 2101 which may indent inwardly into the body 201, toward the first side wall 401. Each fixing slot 2101 has a length slightly greater than the depth of the wall module 101. Each fixing slot 2101 is approximately parallel with the top wall 1601 and is therefore angled with respect to the back wall 301. Each fixing slot 2101 may be substantially similar to each fixing slot comprised on the first side wall 401. The fixing slots 2101 of the first side wall 401 may be arranged diametrically opposite the fixing slots 2101 of the second side wall 501, such that the four fixing slots 2101 comprise two pairs of diametrically opposed fixing slots 2101. A first pair of fixing slots 2101 may be arranged in the cell 601 above the lowermost cell, and a second pair of fixing slots 2101 may be arranged in the cell 601 below the uppermost cell. The back wall 301 may be joined to the top wall 1601, first side wall 401, bottom wall 1901 and second side wall 501 about its periphery. The back wall 301 may have a substantially rectangular outline. The back wall 301 may comprise an upper portion 15a01, a middle portion 15b01 and a lower portion 15c01. Each portion 15a01, 15b01, 15c01 may be approximately the same length and width. The upper portion 15a01 may comprise two notches 1401 arranged adjacent one another. The lower portion 15c01 may comprise two notches 1401 arranged adjacent one another. In the embodiment shown, each notch 1401 is a cut-out in the back wall 301 such that the notch forms an internal cavity in the back wall 301. The notches 1401 comprises a partial square shape, in which an upper side of the square is replaced with two lines extending toward the top wall 1601 and meeting at a mid-way point. A lower edge 14a01 of each notch 1401 is sloped inwardly, such that there is a slope from the back wall 301, specifically from the upper portion 15a01 of the back wall 301 with respect to the notches 1401 comprised in the upper portion 15a01, and from the lower portion 15c01 of the back wall 301 with respect to the notches 1401 comprised in the lower portion 15c01, into each respective notch 1401. The middle portion 15b01 of the back wall 301 comprises a mounting depression 801 as that described in relation to wall module 1. The mounting depression 801 comprises an upper inclined surface 1001 and a lower inclined surface 1101, each inclined surface 1001, 1101 being inclined into the back wall 301 to create a depression in the back wall 301. The upper inclined surface 1001 and the lower inclined surface 1101 are joined by a substantially planar surface 1201. The substantially planar surface 1201 is therefore depressed into the back wall 301. A plurality of ribs 1301 may project outwardly from across part of the upper inclined surface 1001 and part of the planar surface 1201. In the embodiment shown, there may be seven ribs 1301. The ribs 1301 may be joined across their outermost ends to form a hanging means 901. The hanging means 901 may comprise a lower surface 9a01 (see Figure 20a) which is the same as that described in relation to wall module 1. The lower surface 9a01 may be angled at approximately 60° relative to the planar surface 1201 such that it facilitates the placing of a correspondingly shaped article below, to therefore support the wall module 101. In the embodiment shown, the inner surface 4b01 of the first side wall 401 and the inner surface 5b01 of the second side wall 501 may comprise diametrically opposed runners 2201. Each diametrically opposed pair of runners 2201 may be angled with respect to the back wall 301, and may be angled such that they are substantially parallel with the back wall 1601. Each runner 2201 may comprise a slot into which an edge of a blade may be reversibly inserted such that the blade may be held, temporarily, within each runner 2201. Each blade may be identical to that described in relation to wall module 1. Each blade may comprise a rectangular planar surface having a plurality of apertures. In the embodiment shown, there may be approximately 400 apertures in the blade. The apertures may be equally distributed across the planar surface save for relatively narrow peripheral portions of the planar surface. Each blade may comprise an upper edge portion and a pair of edge portions, each of which project above and below the planar surface. Each edge portion comprises a clip. When a blade is inserted into diametrically opposed runners 2201 of the wall module 101, the clips on each edge portion interact with an upper portion of each runner 2201 to create a friction-fit between the clip and the runner 2201, therefore, holding the blade in its place in the wall module 101. To remove a blade from the wall module, a user merely needs to provide enough force to pull the blade out from the runners 2201 in which it is inserted, overcoming the friction-fit force applied by the clips on the runners 2201. Alternatively, a user may slightly bias the clips away from the runners 2201, overcoming the friction-fit force applied by the clips on the runners 2201, and lift the blade out of the runners 2201. With reference to Figures 21 to 24, there is shown a wall structure 3301 according to a further embodiment. It is to be noted and will be understood that the wall structure 3301 is similar to the wall structure 33 described in relation to Figures 11 to 14. It will further be understood that, in respect to the following description of wall structure 3301, if a feature is not described in detail, then it is to be understood that such feature may be the same as the corresponding feature as described in relation to wall structure 33. In the embodiment shown, the wall structure 3301 comprises three wall panels 24a01, 24b01, 24c01. Each wall panel 24a01, 24b01, 24c01 comprises an outer facing surface 2501 and an inner facing surface 2601. In use, the inner facing surface 2601 may face a building (not shown) or other structure to which the wall structure 3301 is to be fitted. The outer facing surface 25a01, 25b01, 25c01 of each wall panel 24a01, 24b01, 24c01, respectively, may comprise an upper portion, a middle portion and a lower portion. In the embodiment shown, the upper portion of each wall panel 24a01, 24b01, 24c01 comprises two protrusions 28. The upper portion of wall panel 24a01 comprises protrusions 28a01a and 28a01b arranged adjacent one another. The upper portion of wall panel 24b01 comprises protrusions 28b01a and 28b01b arranged adjacent one another. The upper portion of wall panel 24c01 comprises protrusions 28c01a and 28c01b arranged adjacent one another. The outer facing surface 25a01, 25b01, 25c01 of each wall panel 24a01, 24b01, 24c01, respectively, may be considered to be roughly split into four considerably equally-sized quadrants. Protrusions 28a01a, 28b01a, 28c01a are each arranged in an upper left quadrant of the respective outer facing surface 25a01,25b01,25c01 of each wall panel 24a01, 24b01,24c01, respectively. Protrusions 28a01b, 28b01b, 28c01b are each arranged in an upper right quadrant of the respective outer facing surface 25a01, 25b01, 25c01 of each wall panel 24a01, 24b01, 24c01, respectively. Protrusions 28a01c, 28b01c, 28c01c are each arranged in a lower left quadrant of the respective outer facing surface 25a01, 25b01, 25c01 of each wall panel 24a01, 24b01, 24c01, respectively. Protrusions 28a01d, 28b01d, 28c01d are each arranged in an upper left quadrant of the respective outer facing surface 25a01, 25b01, 25c01 of each wall panel 24a01, 24b01, 24c01, respectively. Each protrusion 28 projects from the outer facing surface 25 of each wall panel 24 by a distance of approximately 3cm. The shape of each protrusion 28 is similar to that of an upwardly facing arrow-head and corresponds to the internal cavity in the back wall 301 formed by the notches 1401 of the wall module 101. In the embodiment shown, the middle portion of each wall panel 2401 comprises a pair of supporting means 27. The middle portion of wall panel 24a01 comprises a pair of supporting means 27a01. The middle portion of wall panel 24b01 comprises a pair of supporting means 27b01. The middle portion of wall panel 24c01 comprises a pair of supporting means 27c01. Each supporting means 27 is identical to the supporting means 27 described in relation to the embodiment shown in Figures 11 to 14. Each supporting means 27a01, 27b01, 27c01 comprises a cut-out section of the respective wall panel 24a01, 24b01, 24c01, the cut-out section being extended outwardly, away from the outer facing surface 25a01, 25b01, 25c01 of the respective wall panel 24a01, 24b01, 24c01, at an angle of between 45° and 90°, exemplified in the shown embodiment at about 55°, to form an upwardly facing surface. Each supporting means 27a01, 27b01, 27c01 may be arranged horizontally on the outer facing surface 25a01, 25b01, 25c01, therefore ensuring horizontal alignment of a wall module 101 when, in use, it is supported, through interaction of the supporting means 27a01, 27b01, 27c01 and hanging means 901, on each respective wall panel 2401. In the described embodiment, and as shown in Figure 23 in relation to wall panel 24a01, the supporting means 27a01 comprises three, equidistantly spaced ribs 3801. Each rib 3801 projects from a portion of the outer facing surface 25a01 proximal to the upwardly facing surface, and joins to an underside of the upwardly facing surface. The substantially planar outer facing surface 25a01, 25b01, 25c01, save for the supporting means 27a01,27b01, 27c01 and the protrusions 28, allows for a wall module 101 to sit flush against the wall panel 24a01, 24b01, 24c01 when in use. In use, the lower surface of the hanging means 901 of a wall module 101 abuts an upwardly facing surface of the supporting means 27a01, 27b01, 27c01. The mounting depression 801 of the wall module 101 provides an adequate void for the supporting means 27a01, 27b01, 27c01 to be inserted into, allowing the aforementioned interaction between the lower surface 9a of the hanging means 901 and the upwardly facing surface of the supporting means 27a01, 27b01, 27c01. Thus, the wall module 101 is supported by the wall panel 24a01, 24b01, 24c01. Further support is provided by the interaction of the protrusion 28a01a, 28a01b, 28b01a, 28b01b, 28c01a, 28c01b of the respective wall panel 24a01, 24b01, 24c01 and the notches 1401 of the wall module 101. In use, the notches 1401 are overlaid on the corresponding protrusion 28a01a, 28a01b, 28b01a, 28b01b, 28c01a, 28c01b such that the protrusion 28a01a, 28a01b, 28b01a, 28b01b, 28c01a, 28c01b has been inserted into the corresponding notch 1401. The protrusion 28a01a, 28a01b, 28b01a, 28b01b, 28c01a, 28c01b and notches 1401 may be correspondingly shaped so as to allow a good fit of the protrusion 28a01a, 28a01b, 28b01a, 28b01b, 28c01a, 28c01b within the notches 1401. The interaction between the notches 1401 and protrusion 28a01a, 28a01b, 28b01a, 28b01b, 28c01a, 28c01b provides further support for the wall module 101 upon the wall panel 24a01, 24b01, 24c01. The substantially planar back wall 301 of the wall module 101 save for the mounting depression 801, and the substantially planar wall panel 24a01, 24b01, 24c01, save for the supporting means 27a01, 27b01, 27c01 and protrusion 28a01a, 28a01b, 28b01a, 28b01b, 28c01a, 28c01b, means that the back wall 301 is flush against the outer facing surface 25a01, 25b01, 25c01 except for the lower inclined surface 1101 and a portion of the planar surface 1201 of the mounting depression 801. The advantages of such an arrangement are stated in the corresponding statements of the invention. It will be clear to the skilled person that each wall panel 24a01, 24b01, 24c01 may comprise a first side portion and a second side portion as described in relation to the embodiment shown in Figures 11 to 14. Thus, the present embodiment also clearly comprises channels, apertures, cut out portions extended portions as described in relation to the embodiment shown in Figures 11 to 14. It will further be understood that the means of connecting adjacent wall panels 24a01, 24b01, 24c01 to one another is the same as in the embodiment shown in Figures 11 to 14 and described herein. For brevity, the features of connection between adjacent wall panels is not repeated in relation to the present embodiment. Similarly, the inner facing surface of each wall panel 24a01,24b01,24c01 comprises a series of ribs, as shown and described in relation to Figures 11 to 14. For brevity, such features are not repeated in respect of the present embodiment. It will also be understood that the ‘clip-fit’ method of affixing adjacent wall panels 24a01, 24b01, 24c01 is the same as that described in relation to the embodiment shown in Figures 11 to 14. Figure 25 shows a wall structure 3301a in an alternate arrangement of wall structure 3301, namely an increased number of wall panels, some of which are connected to adjacent wall panels arranged above / below, in use. Wall structure 3301a comprises nine wall panels 24a01, 24b01, 24c01, 24d01, 24e01, 24f01, 24g01, 24h01, 24i01. It will be understood that the method of connecting adjacent wall panels is that as described herein. Figures 26 and 27 show a Living Wall system 3401 comprising wall structure 3301 which in turn comprises wall panels 24a01, 24b01, 24c01, as herein described. The Living Wall system 3401 further comprises wall modules 101a, 101b, 101c. Each wall module 101a, 101b, 101c is identical to wall module 101 as herein described. In the embodiment shown, wall module 101a is supported upon wall panel 24a01, wall module 101b is supported upon wall panel 24b01, and wall module 101c is supported upon 24c01. It will be clear to the skilled person that the mechanics of connecting each wall module to its respective wall panel is that as described in relation to the embodiments of Figures 17 and 23. Figures 28-30 show a wall module 102 according to a further embodiment of an aspect of the invention. For ease of illustration, blades have been omitted from figures 28-30. However, it will be readily understood that, in use, corresponding blades will be inserted into diametrically opposed pair of runners 2202, as in the previously described embodiments of wall modules 1 and 101. The blades used with the wall module 102 shown in figures 28-30 may be the same as those described in relation to the wall module 1. Wall module 102 comprise much the same features as that of wall modules 1 and 101. Noticeably, the width of wall module 102 is reduced compared to that of wall modules 1 and 101. Wall module 102 has a width approximately half that of wall modules 1 and 101, such that the width (i.e., the distance from the first side wall 402 to the second side wall 502) of wall module 102 may be approximately 15cm. The module 102 may comprise a body 202. The body 202 may be substantially rectangular and may be a moulding of a plastics material, preferably a recyclable plastics material. The body 202 may comprise a back wall 302, a first side wall 402, a second side wall 502, a top wall 1602 and a bottom wall 1902. The body 202 may comprise a plurality of cells 602. The cells 602 may be in a vertical arrangement, when in use, such that there is an uppermost cell and a lowermost cell (as in wall module 1). In the described embodiment, the body 202 comprises six cells 602. Adjacent cells 602 are separated from one another by a blade (not shown). The uppermost cell is to be bordered by the top wall 1602 at its upper edge, by a blade at its lower edge, and by a portion of the first side wall 402 and a portion of the second side wall 502 at its side edges. The lowermost cell is bordered by a blade (not shown) at its upper edge, by the bottom wall 1902 at its lower edge, and by a portion of the first side wall 402 and a portion of the second side wall 502 at its side edges. Each cell 602 arranged between the uppermost cell and the lowermost cell is bordered by a blade (not shown) at its upper and lower edges, and by a portion of the first side wall 402 and a portion of the second side wall 502 at its side edges. The top wall 1602 may form an upper periphery of the wall module 102. In the embodiment shown, the top wall 1602 may comprise a lip 16a02 which defines a channel 1702. The channel 1702 may run along the length of the top wall 1602 which may equate to the width of the wall module 102. The channel 1702 may be suitable for accommodating irrigation piping (not shown) from which water can flow into the wall module 102 when in use. The inner surface of the lip 16a02 of the top wall 1602, which partly defines the channel 1702, may comprise at least one ridge 16b02 arranged distal to a base of the channel 1702. Beneficially, the at least one ridge 16b02 may prevent, or at least substantially reduce the possibility of, the irrigation piping becoming dislodged from the channel 1702 and therefore not adequately providing water to the plants and / or soil in the wall module 102. In the embodiment shown, the inner surface of the lip 16a02 comprises three ridges, equidistantly spaced along the inner surface of the lip 16a02. The channel 1702 may comprise at least one slit 1802. The slits 1802 are largely similar to the slits described in relation to wall module 102, and have the same function with respect to allowing water and / or nutrients to be fed to the plants and soil in each cell in use. The bottom wall 1902 may form a lower periphery of the wall module 102. The bottom wall 1902 may comprise a first wall 19a02 angled with respect to the back wall 302, and a second wall 19b02 which is substantially planar with the back wall 302 and, therefore, angled with respect to the first wall 19a02. In the embodiment shown, the bottom wall 1902, specifically the first wall 19a02 of the bottom wall 1902, comprises two openings 2002. Each of the two openings 2002 may be in fluid communication with the lowermost cell of the body 202. Advantageously, this means that water and / or nutrients which flows downwardly through the cells 602 of the body 202 can exit the wall module 102 via each opening 2002. This prevents over saturation of plants and soil in the lowermost cell, and prevents the wall module 102 holding excess water, the weight of which could cause deformation or buckling of the walls of the module 102, in particular the bottom wall 1902 and side walls 402, 502. This also means that, when arranged in a Living Wall system, water and / or nutrients from a first wall module 102 can flow downwardly into a second wall module arranged substantially below the first wall module 102, therefore facilitating the watering and feeding of plants and soil in the lower wall module. The first side wall 402 may join the top wall 1602 and the bottom wall 1902 along an edge of the body 202. The first side wall 402 may comprise an outer surface 4a02 and an inner surface 4b02. The inner surface 4b02 may face an inner surface 5b02 of the second side wall 502. The outer surface 4a02 of the first side wall 402 may comprise two fixing slots 2102 for fixing the wall module 102 to a wall structure, for example to a wall panel. The first side wall 402 is substantially straight, save for each fixing slot 2102 which may indent inwardly into the body 202, toward the second side wall 502. Each fixing slot 2102 has a length slightly greater than the depth of the wall module 102. Each fixing slot 2102 is approximately parallel with the top wall 1602 and is therefore angled with respect to the back wall 302. Each fixing slot 2102 may be of the same form as the fixing slots 21 shown in relation to wall module 1 and, therefore, attach the wall module 102 to a corresponding wall panel in the same way as that described in relation to wall module 1. The second side wall 502 may join the top wall 1602 and the bottom wall 1902 along an edge of the body 202. The second side wall 502 may comprise an outer surface 5a02 and the inner surface 5b02. The inner surface 5b02 may face the inner surface 4b02 of the first side wall 402. The outer surface 5a02 of the second side wall 502 may comprise two fixing slots 2102 for fixing the wall module 102 to a wall structure, for example to a wall panel. The second side wall 502 is substantially straight, save for each fixing slot 2102 which may indent inwardly into the body 202, toward the first side wall 402. Each fixing slot 2102 has a length slightly greater than the depth of the wall module 102. Each fixing slot 2102 is approximately parallel with the top wall 1602 and is therefore angled with respect to the back wall 302. Each fixing slot 2102 may be substantially similar to each fixing slot comprised on the first side wall 402. The fixing slots 2102 of the first side wall 402 may be arranged diametrically opposite the fixing slots 2102 of the second side wall 502, such that the four fixing slots 2102 comprise two pairs of diametrically opposed fixing slots 2102. A first pair of fixing slots 2102 may be arranged in the cell 602 above the lowermost cell, and a second pair of fixing slots 2102 may be arranged in the cell 602 below the uppermost cell. The back wall 302 may be joined to the top wall 1602, first side wall 402, bottom wall 1902 and second side wall 502 about its periphery. The back wall 302 may have a substantially rectangular outline. The back wall 302 may comprise an upper portion 15a02, a middle portion 15b02 and a lower portion 15c02. Each portion 15a02, 15b02, 15c02 may be approximately the same length and width. In the described embodiment, the upper portion 15a02 may comprise one notch 1402. The lower portion 15c02 may comprise one notch 1402. In the embodiment shown, each notch 1402 is a cut-out in the back wall 302 such that the notch forms an internal cavity in the back wall 302. The notches 1402 comprise a partial square shape, in which an upper side of the square is replaced with two lines extending toward the top wall 1602 and meeting at a mid-way point. A lower edge 14a02 of each notch 1402 is sloped inwardly, such that there is a slope from the back wall 302, specifically from the upper portion 15a02 of the back wall 302 with respect to the notch 1402 comprised in the upper portion 15a02, and from the lower portion 15c02 of the back wall 302 with respect to the notch 1402 comprised in the lower portion 15c02, into each respective notch 1402. The middle portion 15b02 of the back wall 302 comprises a mounting depression 802 as that described in relation to wall module 1 and 101. The mounting depression 802 comprises an upper inclined surface 1002 and a lower inclined surface 1102, each inclined surface 1002, 1102 being inclined into the back wall 302 to create a depression in the back wall 302. The upper inclined surface 1002 and the lower inclined surface 1102 are joined by a substantially planar surface 1202. The substantially planar surface 1202 is therefore depressed into the back wall 302. A plurality of ribs 1302 may project outwardly from across part of the upper inclined surface 1002 and part of the planar surface 1202. In the embodiment shown, there may be three ribs 1302. The ribs 1302 may be joined across their outermost ends to form a hanging means 902. The hanging means 902 may comprise a lower surface such as that shown in relation to wall modules 1 and 101. The lower surface 9a02 may be angled at approximately 60° relative to the planar surface 1202 such that it facilitates the placing of a correspondingly shaped article below, to therefore support the wall module 102. In the embodiment shown, the inner surface 4b02 of the first side wall 402 and the inner surface 5b02 of the second side wall 502 may comprise diametrically opposed runners 2202. Each diametrically opposed pair of runners 2202 may be angled with respect to the back wall 302, and may be angled such that they are substantially parallel with the back wall 1602. Each runner 2202 may comprise a slot into which an edge of a blade may be reversibly inserted such that the blade may be held, temporarily, within each runner 2202. Each blade may be substantially similar to that described in relation to wall module 1, albeit that in the presently described embodiment each blade will be of reduced width so as to be accommodated between diametrically opposed runners 2202. Each blade may comprise a rectangular planar surface having a plurality of apertures. In the embodiment shown, there may be approximately 200 apertures in the blade. The apertures may be equally distributed across the planar surface save for relatively narrow peripheral portions of the planar surface. Each blade may comprise an upper edge portion and a pair of edge portions, each of which project above and below the planar surface. Each edge portion comprises a clip. When a blade is inserted into diametrically opposed runners 2202 of the wall module 102, the clips on each edge portion interact with an upper portion of each runner 2202 to create a friction-fit between the clip and the runner 2202, therefore, holding the blade in its place in the wall module 102. To remove a blade from the wall module, a user merely needs to provide enough force to pull the blade out from the runners 2202 in which it is inserted, overcoming the friction-fit force applied by the clips on the runners 2202. Alternatively, a user may slightly bias the clips away from the runners 2202, overcoming the friction-fit force applied by the clips on the runners 2202, and lift the blade out of the runners 2202. Beneficially, as shown in Figures 31 and 32, a Living Wall system 3402 (with blades omitted for clarity) may be formed comprised of wall structure 3301 and a combination of wall modules 101 and wall modules 102. Living Wall system 3402 comprises wall modules 101a and 101b and wall modules 102a and 102b. It will be understood by the skilled person that the provision of wall panel 24c01 comprising four protrusions 28c01a, 28c01b, 28c01c, 28c01d allows for the attachment of two wall modules 102, i.e., 102a and 102b. Wall module 102a is attached to wall panel 24c01 by the corresponding mating of protrusions 28c01a and 28c01c to each of the notches 1402 in the upper portion 15a02 and lower portion 15c02 of wall module 102a, together with hanging means 902 being supported by a first supporting means 27c01 arranged on the left side (when viewed in plan view of Fig. 22) of the outer facing surface 25c01 of wall panel 24c01. Wall module 102b is attached to wall panel 24c01 by the corresponding mating of protrusions 28c01b and 28c01d to each of the notches 1402 in the upper portion 15a02 and lower portion 15c02 of wall module 102b, together with hanging means 902 being supported by a first supporting means 27c01 arranged on the right side (when viewed in plan view of Fig. 22) of the outer facing surface 25c01 of wall panel 24c01. Attachment of wall modules 101a and 101b to wall panels 24a01 and 24b01, respectively, is as described in relation to Figs. 26 and 27. Figures 33-36 show a wall module 103 according to a further embodiment of an aspect of the invention. For ease of illustration, blades have been omitted from figures 33-36. However, it will be readily understood that, in use, corresponding blades will be inserted into diametrically opposed pair of runners 2203, as in the previously described embodiments of wall modules 1, 101 and 102. The blades used with the wall module 103 shown in figures 33-36 may be the same as those described in relation to the wall module 1. Wall module 103 comprises many of the same features as that of wall modules 1, 101 and 102. Noticeably, wall module 103 is reduced in length compared to that of wall modules 1, 101 and 102. Wall module 103 has a length approximately half of that of wall modules 1, 101 and 102, such that the length (i.e., the distance from a top wall 1603 to a bottom wall 1903) of wall module 103 is similar to the length of the upper portion 15a and half of the middle portion 15b of wall modules 1, 101 and 102. The module 103 may comprise a body 203. The body 203 may be substantially rectangular and may be a moulding of a plastics material, preferably a recyclable plastics material. The body 203 may comprise a back wall 303, a first side wall 403, a second side wall 503, a top wall 1603 and a bottom wall 1903. The body 203 may comprise a plurality of cells 603. The cells 603 may be in a vertical arrangement, when in use, such that there is an uppermost cell and a lowermost cell (as in wall module 1). In the described embodiment, the body 203 comprises three cells 603. Adjacent cells 603 are separated from one another by a blade (not shown). The uppermost cell is bordered by the top wall 1603 at its upper edge, by a blade at its lower edge, and by a portion of the first side wall 403 and a portion of the second side wall 503 at its side edges. The lowermost cell is bordered by a blade (not shown) at its upper edge, by the bottom wall 1903 at its lower edge, and by a portion of the first side wall 403 and a portion of the second side wall 503 at its side edges. The cell 603 arranged between the uppermost cell and the lowermost cell is bordered by a blade (not shown) at its upper and lower edges, and by a portion of the first side wall 403 and a portion of the second side wall 503 at its side edges. The top wall 1603 may form an upper periphery of the wall module 103. In the embodiment shown, the top wall 1603 may comprise a lip 16a03 which defines a channel 1703. The channel 1703 may run along the length of the top wall 1603 which may equate to the width of the wall module 103. The channel 1703 may be suitable for accommodating irrigation piping (not shown) from which water can flow into the wall module 103 when in use. The inner surface of the lip 16a03 of the top wall 1603, which partly defines the channel 1703, may comprise at least one ridge 16b03 arranged distal to a base of the channel 1703. Beneficially, the at least one ridge 16b03 may prevent, or at least substantially reduce the possibility of, the irrigation piping becoming dislodged from the channel 1703 and therefore not adequately providing water to the plants and / or soil in the wall module 103. In the embodiment shown, the inner surface of the lip 16a03 comprises three ridges, equidistantly spaced along the inner surface of the lip 16a03. The channel 1703 may comprise at least one slit 1803 which, in the present embodiment, is four slits 1803. The, or each, slit is to be understood as largely similar to the slit described in relation to wall module 101, and have the same function with respect to allowing water and / or nutrients to be fed to the plants and soil in each cell in use. The bottom wall 1903 may form a lower periphery of the wall module 103. The bottom wall 1903 may comprise a first wall 19a03 angled with respect to the back wall 303, and a second wall 19b03 which is substantially planar with the back wall 303 and, therefore, angled with respect to the first wall 19a03. In the embodiment shown, the bottom wall 1903, specifically the first wall 19a03 of the bottom wall 1903, comprises four openings 2003. Each of the four openings 2003 may be in fluid communication with the lowermost cell 603 of the body 203. Advantageously, this means that water and / or nutrients which flows downwardly through the cells 603 of the body 203 can exit the wall module 103 via each opening 2003. This prevents over saturation of plants and soil in the lowermost cell, and prevents the wall module 103 holding excess water, the weight of which could cause deformation or buckling of the walls of the module 103, in particular the bottom wall 1903 and side walls 403, 503. This also means that, when arranged in a Living Wall system, water and / or nutrients from a first wall module 103 can flow downwardly into a second wall module arranged substantially below the first wall module 103, therefore facilitating the watering and feeding of plants and soil in the lower wall module. The first side wall 403 may join the top wall 1603 and the bottom wall 1903 along an edge of the body 203. The first side wall 403 may comprise an outer surface 4a03 and an inner surface 4b03. The inner surface 4b03 may face an inner surface 5b03 of the second side wall 503. The outer surface 4a03 of the first side wall 403 may comprise two fixing slots 2103 for fixing the wall module 103 to a wall structure, for example to a wall panel. The first side wall 403 is substantially straight, save for each fixing slot 2103 which may indent inwardly into the body 203, toward the second side wall 503. Each fixing slot 2103 has a length slightly greater than the depth of the wall module 103. Each fixing slot 2103 is approximately parallel with the top wall 1603 and is therefore angled with respect to the back wall 303. Each fixing slot 2103 may be of the same form as the fixing slots 21 shown in relation to wall module 1 and, therefore, attach the wall module 103 to a corresponding wall panel in the same way as that described in relation to wall module 1. The second side wall 503 may join the top wall 1603 and the bottom wall 1903 along an edge of the body 203. The second side wall 503 may comprise an outer surface 5a03 and the inner surface 5b03. The inner surface 5b03 may face the inner surface 4b03 of the first side wall 403. The outer surface 5a03 of the second side wall 503 may comprise two fixing slots 2103 for fixing the wall module 103 to a wall structure, for example to a wall panel. The second side wall 503 is substantially straight, save for each fixing slot 2103 which may indent inwardly into the body 203, toward the first side wall 403. Each fixing slot 2103 has a length slightly greater than the depth of the wall module 103. Each fixing slot 2103 is approximately parallel with the top wall 1603 and is therefore angled with respect to the back wall 303. Each fixing slot 2103 may be substantially similar to each fixing slot comprised on the first side wall 403. The fixing slots 2103 of the first side wall 403 may be arranged diametrically opposite the fixing slots 2103 of the second side wall 503, such that the four fixing slots 2103 comprise two pairs of diametrically opposed fixing slots 2103. A first pair of fixing slots 2103 may be arranged in the cell 603 above the lowermost cell, and a second pair of fixing slots 2103 may be arranged in the cell 603 below the uppermost cell. The back wall 303 may be joined to the top wall 1603, first side wall 403, bottom wall 1903 and second side wall 503 about its periphery. The back wall 303 may have a substantially rectangular outline. The back wall 303 may comprise an upper portion 15a03 and a middle portion 15b03 which is approximately half the length of a corresponding middle portion 15b, 15b01 and 15b02 of wall modules 1, 101 and 102, respectively. Each portion 15a03 and 15b03 may be approximately the same width. In the described embodiment, the upper portion 15a03 may comprise two notches 1403 arranged adjacent one another, as in wall module 101. In the embodiment shown, each notch 1403 is a cut-out in the back wall 303 such that the notch forms an internal cavity in the back wall 303. The notches 1403 comprise a partial square shape, in which an upper side of the square is replaced with two lines extending toward the top wall 1603 and meeting at a mid-way point. A lower edge 14a03 of each notch 1403 is sloped inwardly, such that there is a slope from the back wall 303, specifically from the upper portion 15a03 of the back wall 303 with respect to the notches 1403 comprised in the upper portion 15a03. The middle portion 15b03 of the back wall 303 comprises a mounting depression 803. The mounting depression 803 comprises an upper inclined surface 1003 inclined into the back wall 303 to create a depression in the back wall 303. The upper inclined surface 1003 inclines to a substantially planar surface 1203. The substantially planar surface 1203 is therefore depressed into the back wall 303. A plurality of ribs 1303 may project outwardly from across part of the upper inclined surface 1003 and part of the planar surface 1203. In the embodiment shown, there may be seven ribs 1303. The ribs 1303 may be joined across their outermost ends to form a hanging means 903. The hanging means 903 may comprise a lower surface 9a03 such as that shown in relation to wall modules 1 and 101. The lower surface 9a03 may be angled at approximately 60° relative to the planar surface 1203 such that it facilitates the placing of a correspondingly shaped article below, to therefore support the wall module 103. In use, the lower surface 9a03 of the hanging means 903 abuts an upwardly facing surface 27ac01 of supporting means 27c01 to provide support to the wall module 103. In the embodiment shown, the inner surface 4b03 of the first side wall 403 and the inner surface 5b03 of the second side wall 503 may comprise two pairs of diametrically opposed runners 2203. Each diametrically opposed pair of runners 2203 may be angled with respect to the back wall 303, and may be angled such that they are substantially parallel with the back wall 1603. Each runner 2203 may comprise a slot into which an edge of a blade may be reversibly inserted such that the blade may be held, temporarily, within each runner 2203. Each blade may be substantially similar to that described in relation to wall module 1. Each blade may comprise a rectangular planar surface having a plurality of apertures. In the embodiment shown, there may be approximately 400 apertures in the blade. The apertures may be equally distributed across the planar surface save for relatively narrow peripheral portions of the planar surface. Each blade may comprise an upper edge portion and a pair of edge portions, each of which project above and below the planar surface. Each edge portion comprises a clip. When a blade is inserted into diametrically opposed runners 2203 of the wall module 103, the clips on each edge portion interact with an upper portion of each runner 2203 to create a friction-fit between the clip and the runner 2203, therefore, holding the blade in its place in the wall module 103. To remove a blade from the wall module, a user merely needs to provide enough force to pull the blade out from the runners 2203 in which it is inserted, overcoming the friction-fit force applied by the clips on the runners 2203. Alternatively, a user may slightly bias the clips away from the runners 2203, overcoming the friction-fit force applied by the clips on the runners 2203, and lift the blade out of the runners 2203. Beneficially, as shown in Figures 37-39, a Living Wall system 3403 (with blades omitted for clarity) may be formed comprised of wall structure 3301 and a combination of wall modules 101 and wall module 103. Living Wall system 3403 comprises wall modules 101a and 101b and wall modules 103. It will be understood by the skilled person that the provision of wall panel 24c01 comprising four protrusions 28c01a, 28c01b, 28c01c, 28c01d allows for the attachment of two wall modules 103, with only one wall module 103 being shown in Figures 37-39. Wall module 103 is attached to wall panel 24c01 by the corresponding mating of protrusions 28c01a and 28c01b to each of the notches 1403 in the upper portion 15a03 of wall module 103, together with hanging means 903 being supported by a first supporting means 27c01 of the outer facing surface 25c01 of wall panel 24c01. While it is not shown in Figures 37-39, it will be understood that a further wall module of the type shown by wall module 103 may be attached to wall panel 24c01 by the corresponding mating of protrusions 28c01c and 28c01d to each of notches 1403 in upper portion 15a03 of wall module 103. In absence of a supporting means arranged on a lower portion of wall panel 24c01, the top wall 1603 of the further wall module 103 may inserted beneath the second wall 19b03 of the bottom wall 1903 to provide 5 support to the further wall module 103. Attachment of wall modules 101a and 101b to wall panels 24a01 and 24b01, respectively, is as described in relation to Figs. 26 and 27. Figures 40 and 41 show examples of a Living Wall system 3401a. In such example embodiments, the Living Wall system 3401a comprises nine identical wall 10 modules 101a, 101b, 101c, lOld, lOle, lOlf, 101g, lOlh and lOli attached to wall panels 24a01, 24b01, 24c01, 24d01, 24e01, 24f01, 24g01 (not shown), 24h01 (not shown) and 24i01, respectively. The one or more embodiments are described above by way of example only. Many variations are possible without departing from the scope of protection afforded 15 by the appended claims.

Claims

1. A wall module for soil and plants for use in a living wall system, the modulecomprising a body, the body comprising a back wall, a first side wall and a second side wall, the body further comprising at least two cells, the at least two cells being separated from one another by a blade angled with respect to the back wall, and wherein the back wall comprises a mounting depression, the mounting depression comprising a hanging means for hanging the wall module to a wall structure.

2. A wall module according to claim 1, wherein the mounting depression comprises an upper inclined surface and a lower inclined surface, the two inclined surfaces being inclined toward one another.

3. A wall module according to claim 2, wherein the mounting depression comprises a planar surface between the upper inclined surface and the lower inclined surface.

4. A wall module according to any preceding claim, wherein the hanging means is a projection arranged across a portion of the mounting depression.

5. A wall module according to claims 3 and 4, wherein the hanging means projects above the planar surface by no more than the depth of the mounting depression.

6. A wall module according to any preceding claim, wherein the hanging means is attached to the module by at least one rib, preferably at least five ribs.

7. A wall module according to any preceding claim, wherein the back wallcomprises a notch, preferably wherein the notch is comprised in an upper portion of the back wall.

8. A wall module according to any preceding claim, wherein the wall module comprises a top wall, the top wall comprising a channel running across the top wall of the wall module, preferably wherein the channel comprising at least one slit, further preferably wherein the channel is in fluid communication with an uppermost cell of the body via the at least one slit.

9. A wall module according to any preceding claim, wherein the wall module comprises a bottom wall, the bottom wall comprising at least one opening, preferably wherein the at least one opening is in fluid communication with a lowermost cell of the body.

10. A wall module according to any preceding claim, wherein the first side wall and the second side wall each comprise at least one fixing slot for fixing the wall module to the wall structure.

11. A wall module according to claim 10, wherein the first side wall and the second side wall each comprise an outer surface, and each outer surface of the first side wall and the second side wall comprises the at least one fixing slot.

12. A wall module according to any preceding claim, wherein the first side wall and the second side wall each comprise an inner surface, and each inner surface of the first side wall and the second side wall comprises corresponding runners, angled with respect to the back wall.

13. A wall module according to claim 12, wherein each blade is removably inserted into a corresponding pair of runners.

14. A wall module according to any preceding claim, wherein each blade comprises a plurality of apertures.

15. A wall module according to claim 14, wherein each aperture is closed around its edges.

16. A wall module according to claim 14 or 15, wherein at least 90% of the total number of apertures are hexagonal.

17. A wall module according to any of claims 14 to 16, wherein each blade comprises at least 300 apertures.

18. A wall module according to claim 17, wherein each blade comprises about 400 apertures.

19. A wall module according to any preceding claim, wherein each blade is removable from the wall module.

20. A wall module according to any preceding claim, wherein the wall module is formed of recycled materials.

21. A wall module according to any preceding claim, wherein the wall module comprises two, three, four, five, or six blades.

22. A wall panel for forming a wall structure, the wall panel comprising an outer facing surface and an inner facing surface, the outer facing surface comprising at least one supporting means arranged across a portion of the outer facing surface, the outer facing surface further comprising at least one protrusion arranged to protrude above the plane of the outer facing surface.

23. A wall panel according to claim 22, wherein the wall panel comprises a central portion comprising the at least one supporting means.

24. A wall panel according to claim 22 or 23, wherein the wall panel comprises a first side portion and a second side portion, wherein the first side portion and / or the second side portion comprises at least one channel for receiving a fixing means.

25. A wall panel according to any of claims 22 to 24, wherein the first side portion and / or the second side portion is depressed relative to the central portion.

26. A wall panel according to any of claims 22 to 24, wherein the first side portion and / or the second side portion is planar with the central portion.

27. A wall panel according to any of claims 22 to 26, wherein the wall panel comprises more than one central portion, each central portion being flanked by a first side portion and a second side portion.

28. A wall panel according to claim 27, wherein the wall panel comprises three central portions and four side portions.

29. A wall panel according to any of claims 22 to 28, wherein the wall panel comprises a first protrusion and a second protrusion, optionally wherein the first protrusion is arranged between the at least one supporting means and a top edge of the wall panel, and optionally wherein the second protrusion is arranged between the at least one supporting means and a bottom edge of the wall panel.

30. A wall panel according to claim 29, wherein the wall panel comprises two protrusions arranged between the at least one supporting means and the top edge of the wall panel, and / or wherein the wall panel comprises two protrusions arranged between the at least one supporting means and the bottom edge of the wall panel.

31. A wall panel according to any of claims 22 to 30, wherein the at least one supporting means is arranged to support the hanging means of the wall module according to any of claims 1 to 21.

32. A wall structure comprising a plurality of wall panels according to any of claims 22 to 31.

33. A wall structure according to claim 32, wherein adjacent wall panels are connected to one another by the connection of adjacent depressed and planar side portions.

34. A living wall system comprising at least one wall panel according to any of claims 22 to 31 and at least one wall module according to any of claims 1 to 21, wherein the at least one wall module is supported on the at least one wall panel by engagement between corresponding supporting means of the at least one wall panel and hanging means of the at least one wall module.

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