Invisible concrete cube Answered
This concrete cube made by Daniel Franke and Markus Kison has the amazing ability to turn invisible. Thanks to eye-tracking and a video projector for each face of the cube, the cube has the view behind it projected onto its faces. The result is like looking through a glowing window instead of a cube. You can see the effect in the video. It's not entirely smooth yet, but a very cool idea.
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photo: Durchsehen, Exp. 01 (augmented perspective) by Markus Kison, on Flickr