The Video Turntable is basically a device that “uses a webcam instead of a phonograph needle, transparent discs with color patterns instead of traditional black discs with grooves, and a digital computer vision system instead of analog circuits to decode and produce sound.” Video demonstration after the jump.
Multiple transparent discs can be stacked, creating different combinations of colors and thereby sound. Depending on which area colors appear in a webcam’s view, the system controls pitch, pan, volume, delay, etc.
[via w-m-m-n-a]