A year or two back, my mom told me about Strandbeests, the work of Theo Jansen. Tough to explain, these self-moving art pieces are like creatures, but made to move without motors. They use simple parts like PVC pipes. The Exploratorium is hosting the West Coast's only installation of Jansen's tour, and is live now. At the exhibition you'll be able to interact with the Strandbeests, see drawings of their creation, watch immersive video and see live demonstrations.
The Explortorium exhibit runs through September 5, 2016. You can read more about the Strandbeests and exhibit at this SFGate article. You'll need a special ticket for the exhibition.