The Screen Sees You

Microsoft's Edison lab | The Verge:

Glass screen acts as a lens, redirecting light from in front of the screen to a side watching camera. This enables the display to detect touch and movement a few centimetres above the surface.

Able to see, the screen reproduces the sticky note which as held up to the display. 
The paper note becomes a digital object in the computer.

Another interesting thing they are working on is multiple head (and eye) tracking. Rather than an image on a surface the they are using the screen as a lens to project video to the position of your eye, tracked in 3D space. The projected video is specific to the angle and distance of each eye for each head, making the 3D experience relative to the position of each viewer.

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