OmniTouch

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algorithms detect fingers and actions any surface becomes a touch screen multi-touch gestures on the skin Apple patents have been registered for iOS projection devices

http://techcrunch.com/2011/10/17/cmu-researchers-turn-any-surface-into-a-touchscreen/

http://www.patentlyapple.com/patently-apple/2011/08/apple-reveals-big-plans-to-integrate-projectors-into-ios-devices.html