Gravity is a pen and pad that allows to sketch in 3D space using augmented reality. The cool patent-pending system hardware and software system has gone through several working prototypes and now they are looking to start manufacturing. Check out the video—it's pretty cool.
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Gravity's creators—a group of four Innovation Design Engineering students of the Royal College of Art, London—think that it can really change the creative process for designing 3D objects.
I do like the idea of using the pad as a 3D plane that I can rotate around in order to build new facets of an object. It may be a good way to intuitively create 3D sketches that can serve as a base for 3D modeling in the computer.