I've simplistically assumed we would advance from "dumb" paper with things printed on it to some smarter variant, where every sheet of paper is an iPad. But as researchers at Fujitsu Laboratories demonstrate here, there's still plenty of room to design new interfaces that are between those two extremes.
By combining an ordinary webcam, a computer and an off-the-shelf projector, Fujitsu's "FingerLink Interaction System" provides a new user interface that effectively turns a "dumb" piece of paper, and the table it's sitting on, into a touchscreen. Check out how they did it, and peep the CAD demo starting around 2:43:
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