Apple patents touchscreens/The work of Jeff Han

I've come across a video along similar lines. It shows Johnny Chung Lee, at Carnegie Mellon University, who has developed a cheap way of converting surfaces to the equivalent of electronic whiteboards, using a "pen" with an LED and a Wii remote. As part of his demonstration, he shows that he can use two pens for multitouch interaction (err, well, sort of multi"touch"...). ;)
 
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