An optical controller is capable of surrounding a player with a radiation screen from a plurality of panels, and enables the player to produce control signals for interface with a controlled instrument such as a musical instrument, a video game processor, etc. The insertion of the appendage of the player...http://www.google.de/patents/US5414256?utm_source=gb-gplus-sharePatent US5414256 - Apparatus for and method of controlling a device by sensing radiation having an emission space and a sensing space
