Hi all. A friend and I were discussing whether or not it was possible to construct a mechanism of weights and pulleys etc. or other methods to keep a seesaw level regardless of where the weight was placed on the platform. The end result would be the ability to step onto one side of a level seesaw, and walk to the other end without it moving on its horizontal plane. Here are a few illustrations to help visualize the forces at work: What does everyone think? Is it possible?