da vinci perpetual motion - (Faisal Al-Jabri)

fascinating to watch when animated, It is supposed to work on the principle of a constantly shifting center of gravity – the wheel always wants to turn in one direction; after printing, you need eight 5mm ball bearings balls to turn the wheel; enjoy!

http://www.youtube.com/watch?v=1nK2NkoUbes
http://www.youtube.com/watch?feature=player_embedded&v=GhR-K10UjnY

http://www.youtube.com/watch?v=zqG-TL0WnjE#t=83

http://www.youtube.com/watch?v=287qd4uI7-E

http://www.thingiverse.com