Dennis Hong: My Seven Species of Robots
 

http://www.ted.com/talks/dennis_hong..._of_robot.html

I remember someone suggested a variable sprocket so that the diameter of the sprocket, therefore, the gear ratios can change. That same concept is shown in the second robot.

Re: Dennis Hong: My Seven Species of Robots
 

That's awesome. I think it would be kinda cool if first went in the humanoid direction.