According to Cnet, researchers at Carnegie Mellon University have come up with Electrick, a "low-cost touch-sensing technology," which allows to turn pretty much any surface into a touch screen.
It's as simple as adding a conductive coating, such as special paint, to an object and then putting sensing electrodes around the edges of the area you want to make interactive, say the researchers. You can even add a protective coating. To sense the placement of touch, they use a technique called electric field tomography.
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