The software recognizes 3 kinds of gestures:
+ multitouch gestures, like the ones you see in Microsoft Surface or the iPhone -- where you touch the screen and make the map move by pinching and dragging.
+ what I call freehand gestures, like when you take a picture [as in the photo above]. Or, you might have noticed in the demo, because of my culture, I do a namaste gesture to start the projection on the wall.
+ iconic gestures, drawing an icon in the air. Like, Whenever I draw a star, show me the weather. When I draw a magnifying glass, show me the map.
http://blog.ted.com/2009/03/sixth_sense_pranav.php
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