Interactive projection installations are ready-made attractions that respond to people. Most combine a projector or light source, a sensor and software. The range runs from photo booths and brand games to light art, shooting games and sliding screens. Event companies, malls, schools and museums buy them to give visitors something to do. To choose, look at the number of players, whether you need a brand message inside the game, the space and ceiling height, and whether the unit stays fixed or moves between venues.