Theo Jansen's Caterpillar

You are surely familiar with artist Theo Jansen's enormous Strandbeest wind-powered kinetic sculptures. Every time I see one, I always feel sorry for the way he has to chase them down when the wind is blowing and they are walking fast. Yeah, their legs are way longer than his! But now he's got that problem worked out. Not only can he keep his creations on a leash, but he doesn't even have to run to keep up with him. The solution is a chair he calls the Caterpillar. It glides smoothly across the sand on rolling, uh, "wheels" that resemble tank treads. (via Geeks Are Sexy)