This may be the year that 3D television sets flood the market, but some engineers have turned to aircraft in search of a viewing experience that is still more immersive. Two teams at the Massachusetts Institute of Technology are working on a unique 3D display dubbed Flyfire, in which a flock of tiny aircraft carrying multicoloured LEDs hover in front of the viewer to form an image. As pixels that can move through space, the free-flying LEDs could form a shape-shifting 3D display.

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http://www.newscientist.com/article/dn18581-3d-display-made-of-flying-pixelcopters-in-the-works.html