A research group from Keio University presented at SFC Open Research Forum 2010, a method to detect the deformations of a plain paper. A simple paper is curved above a projector, which projects an image on it. If the paper is deformed due to a touch or a blow of air, a camera beneath detects the deformation of the image using Active Stereo-Vision to do 3D image measurements. The system then responds to this action accordingly. Visit the youtube channel of Diginfonews for more videos.