It's a puzzle. It's a coaster. It's the Puzzle Coaster! Available in many designs, each set of four coasters comes in one design and 4 different colors, so you can mix and match to create your own piece of modern art. Each coaster puzzle is cut from birch wood and handmade in the USA. The patented locking concept prevents the pieces from sticking to glass condensation and from the pieces falling out of the coaster if you turn it upside down.