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Researchers at [link url=http://www.cmu.edu target=_blank]CMU[/link] have developed a touchpad that can be easily [link url=http://yang-zhang.me/research/Electrick/Electrick.html target=_blank]sprayed on[/link]. Conductive paints are applied to any object, a few electrodes are attached on the edges. Algorithms from computer vision localize the finger touch. Whether on walls, toys or steering wheels – the possibilities are unlimited.