An improved video system that enables a player to interact with mid-air stereo perception images of foreshortened perspective animation and with animation displayed on the projection screen or monitor, by controlling the motions of a robotic simulation apparatus deployed in front of the projection screen....http://www.google.ca/patents/US5239464?utm_source=gb-gplus-sharePatent US5239464 - Interactive video system providing repeated switching of multiple tracks of actions sequences
