Like all this!
Wind powered beach walker: http://www.youtube.com/watch?v=a7Ny5BYc-Fs
More beasts on the beach (designed with a genetic algorithm!): http://www.strandbeest.com/
Robot dog: http://www.youtube.com/watch?v=W1czBcnX1Ww
These are all made of math. Beautiful, beautiful math. And some staples or something, I don’t really know the details.