These awesome coasters are from ThinkGeek and when arranged correctly appear to form a 3 Dimensional image of the human brain. The set contains ten coasters, each with a brain slice print to create the illusion of a full brain. The coasters are helpfully labeled to help you assemble the brain.
Here’s the description: ‘Each set of Brain Specimen Coasters comes with ten glass coasters. Each coaster has four rubber feet (to further protect the surfaces the coasters are protecting in the first place) and a slice of brain printed on it. If you stack your Brain Specimen Coasters in the proper order (which is easy to do, since the coasters are labeled) and look from the proper angle, you’ll see a full brain. Plus, if you use your Brain Specimen Coasters at your next science party, your friends will know how thoughtful you really are. Get it? Brain Specimen Coasters? Thoughtful?’
ThinkGeek have also launched another product in the same range, which when arrange correctly form an anatomical human heart.