I got on a real roll about 2 years ago after seeing a video of a kinetic sculpture---I thought at the time it was one of the neatest things I had ever seen!!! I did a whole lot of web searching and found videos of both the steam powered one by "steampunk" and the ( I think) battery powered one built by the engineering students. I even found an animation of exactly how they work, but I can't remember where now. I thought very seriously about building one, but as I said, the damned things have more legs than a centipede---. I think the legs were multiple machined or laser cut profiles of light brass sheet, rivetted together with spacers. I decided that although it was definitly not outside my capability to design one, it far exceeded my machining desire to build so many identical parts. They sure are neat though!!!