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Kåre Halvorsen, a Norwegian engineer, has a very cool side project that he's working on. Called MorpHex, it's a Hexapod robot capable of turning into a sphere and then back again. The project is still under construction (you can follow the details on Kare's blog here), but it's already shaping up to look very cool, as you can see in the video below.
I'm looking forward to seeing the whole thing when it's completed. One feature to be added: when the robot is in its sphere mode, it will be able to autonomously roll around.
Thanks to Robot Living for the link.