This is cool :) Kinda thing that makes you want to go back to school ;)
http://vimeo.com/2952236
COOL! ;D How does it sense the tilt of the pendulum?
How does it work??? Beats me.
Some discussion (assuming you intend to read all of it ;) ) and more cool video links here :
http://www.reddit.com/r/math/comments/ebql6/double_inverted_pendulum_crosspost_from_rphysics/
Seems like a system thats able to get the "stick" reach a stable position and tries to retain it there. Pretty brainy!!
Exactly the reason why I posted it !
The modeling of the motion, and the feedback mechanism seems very cool !