Blast from the Past - Tinkertoys that can Walk, but Can't Stand Still

Standing humans aren't particularly stable. As most martial arts practitioners know, it doesn't take much to knock a standing person down. That's because, when standing, your center of gravity is above the point where you touch the ground and your feet provide a relatively small platform. If you tip even slightly, your center of gravity is no longer over your feet, and you either have to take a step or fall over. If we aren't stable standing still, you might imagine that walking is that much mor...