Strandbeests

I am currently besotted with the Strandbeests of Dutch engineer/inventor Theo Jansen. They're made out of lightweight plastic piping and walk along the shore using wind power, turning back if they run into either waves or loose sand. (There was a clip of a longer documentary where he mentioned something about them helping to keep the sand in the dunes, and therefore the sea out of the Netherlands, but I'm not sure if I've got that right). Anyway, here's a video of some in action:

Aren't they fantastic? More information over at www.strandbeest.com.