If you couldn’t tell from perusing the pages of Cool Material, we have a thing for desktop toys, little doohickeys to help pass the time between meetings and assignments. The latest we want to add to the collection is the Venn Puzzle from our friends at Craighill, a Brooklyn-based product design studio. The Venn Puzzle is composed of three identical pieces of die-cast stainless steel. When assembled, the three pieces fit nicely together to form a sphere that’s roughly the size of a billiard ball. After you spin it and the pieces fall apart, however, you’ll find that putting them back together is easier said than done. The puzzle is up on Kickstarter now. We suggest you back it so your clients have something to play with while you punch away at some docs.