Johnny Lee is a student at Carnegie Mellon University who has been developing a series of methods to repurpose the Nintendo Wii’s infrared wireless joystick. His latest projects have been developing multi-point interactive systems, seen here.

The Wii joystick ordinarily reads two infrared points (usually an infrared light bar that comes with the game system, although other sources can be used) and outputs coordinates for the motion of the joystick based on where it sees the two points. In this demonstration, he keeps the joystick’s location static and uses bounced infrared light from his fingers to control a small application in C#.

Some of the other videos he shows in the link are capable of many more points of interaction and control.