Simultaneous mechanical motion is found in camera apertures, foldable steamer baskets, and other delightful objects. The motion of all parts is connected through overlaps, gears, or linkages. Pull on one part and everything moves together. The unique feature of the Venn Puzzle is that it achieves this simultaneous motion without a larger constraining system. It's simply the 3 parts interacting with themselves that create this mesmerizing movement. A puzzle like this doesn't do anything. It won't take a photo or help steam your vegetables. Nevertheless, we still care about "useless" objects like these. We spend a lot of time working with beautiful mechanisms and sometimes it's nice to showcase these discoveries in the most pure and satisfying way possible. We call this one the Venn Puzzle!