This was a rather intriguing talk (2009) on a technology that involved wearing a camera and a projector. It would project images on the surfaces around you (based on the physical object) and allow digital interactions with them. Similarly, the objects and surfaces could be used to feedback to the device.
The latency of this system was poor - not very usable, IMO. But as a technology demonstration it is very interesting, and perhaps could offer some new perspectives. http://www.ted.com/talks/pranav_mistry_the_thrilling_potential_of_sixthsense_technology.html -- bringing s-words to a pen fight
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