A ball or sport accessory allows players to interact using a variety of computing functions; combines one or more sensors, displays, cameras, projectors, memory, hardware, processors or other components capable of providing computer functionality; allows users to record and share images and video, to receive live directions from coaches or other players, to understand or correct mistakes by replaying videos instantaneously, or to undertake other computing activity without the need of additional devices; allows users to listen to music or to watch two or three dimensional movie or television files; and/or functions as a cell phone. The ball or sport accessory may allow users to play video games, view holograms, project images or videos, and download websites and/or third party applications. The sport accessory may determine whether the user has sustained an impact that may cause a concussion, or whether the user may suffer a sunstroke.