Theo Jensen creates works of art & engineering that walk on their own. I cant believe that such a giant Sculpture (should I call them as a Robotic form of art) just walks around using wind as the energy source. Its simply amazing!
Posted few awesome videos demonstrating his work including couple of How-it-works videos as well.
Video - 1
Lego has even released Toys - on Jensons models
I found couple of simulation video on how Jenson's Machanism works.