More about Arthur Ganson from the TED web site:
A modern-day creator of "twittering machines," Arthur Ganson uses simple, plain materials to build witty mechanical art. But the wit is not simply about Rube Goldberg-ian chain-reaction gags (though you'll find a few of those). His work examines the quiet drama of physical motion, whether driven by a motor or by the actions of the viewer. Notions of balance, of rising and falling, of action and reaction and consequence, play themselves out in wire and steel and plastic.
Ganson has been an artist-in-residence at MIT (where the Lemelson-MIT Award Program named him an Inventor of the Week, and where his show "Gestural Engineering" is ongoing) and has shown his work at art and science museums around the world -- including a current, held-over show at the phaeno in Wolfsburg, Germany.
[ Thanks Richard and Steve! ]