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Microsoft Research have come up with this wearable projector. It's a Kinect motion controller and a pico projector wich mounts on your shoulder and projects onto a surface. You can then interact with the surface like a touchscreen.
Motion sensitive shoes
Shoes measure dance movements relayed to the circuit board on the side of the shoe and on to the PC. Input then converts the movements into perfectly synchronised music. Perfect for all those Dads trying to dance at weddings.
Credit: Sam Ogden / Science Photo Library