Walking Robot Powered by Wind - Fascinating video, it's actually a commercial for BMW, but...Wow! This contraption doesn't look like it should work. Have a look...

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Walking Robot Powered by Wind

Kinetic Sculptures: Wind Powered Robots at Ministry of Tech | The Best of Tech
Dutch creator inventor/artist Theo Jansen creates what he calls "Kinetic Sculptures," where nature and technology meet. These sculptures or robots are powered solely by the wind.