'Sixth sense' ubiquitous gadget

MIT researchers created a 300 dollar sixth sense ubiquitous portable computing device: a necklace that channels Internet information into daily routines. The device can turn any surface into a touch-screen for computing, controlled by simple hand gestures. The gadget can even take photographs if a user frames a scene with his or her hands, or project a watch face with the proper time on a wrist if the user makes a circle there with a finger. The MIT wizards cobbled a Web camera, a battery-powered projector and a mobile telephone into a gizmo that can be worn like jewelry. Signals from the camera and projector are relayed to smart phones with Internet connections.
More information here and a video.

Reference: http://www.interactiondesign.se/blog/2009/02/6th-sense-without-bruce-willis/