Researchers at Microsoft and Carnegie Mellon University created a prototype called OmiTouch that enables graphical, interactive, multitouch input on arbitrary, everyday surfaces.
According to the paper, The shoulder-worn implementation allows users to manipulate interfaces projected onto the environment (e.g., walls, tables), held objects (e.g.,notepads, books), and their own bodies (e.g., hands, lap). A key contribution is our depth-driven template matching and clustering approach to multitouch finger tracking. This enables on-the-go interactive capabilities, with no calibration, training or instrumentation of the environment or the user,
According to the paper, it is entirely possible that a future incarnation of OmniTouch could be the size of a box of matches, worn as pendent or watch. Thus, the benefit of extreme portability.
See the full paper http://chrisharrison.net/projects/omnitouch/omnitouch.pdf
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