A model of a LEROMUR concrete element. This solid concrete element can be easily broken into 2, 3, or 4 parts by striking the grooved face with a mallet. Once cut, the elements have the appearance of split stone. Projections on one face interlock with the element below. Once dry-assembled without cement, the elements have no possibility of lateral or horizontal slippage. The male and female notches allow for various inclinations of the structure while maintaining a horizontal base: 0°, 15°, 18°, and 23°.