You have to see this video. It's of Kinetic sculptor and artist Theo Jansen who builds "creatures" out of pvc tubing. But the wild part is, these creatures can walk on their own, completely powered by the wind. Soon, he's hoping to make some that can live on the sand dunes on their own, without any human help. I saw Theo show off some of his creatures at an event last year, and was blown away, so I thought you'd enjoy this clip.