A Microsoft Research project dubbed "Mobile Surface" links a mobile phone to a camera and projector, letting people interact with a screen projected onto a tabletop by moving their hands in the air above it.

It's named after the company's Surface tabletop computer, and while the portable version doesn't provide nearly the screen resolution of its much larger cousin, Mobile Surface is notable in that it allows for three-dimensional control by sensing not lateral movement but also the distance between the hands and the surface.

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