Skinput Interface
Chris Harrison's concept is a device worn on the arm that recognises the vibrations generated by tapping your own skin. The vibrations generated at different points are unique enough that when coupled with a projector it can be used as a graphical interface. It's hard to tell if this can be refined to a point that it would be useful as a primary input for all the functionality of a phone, but it already seems very powerful as a secondary input for shortcuts.






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