Heat-Changing Coffee Mugs by Unemployed Philosophers Guild

• 14 oz. Ceramic coffee cup with a comfortable handle. • All of our disappearing mugs come in a beautifully designed, colorful box. • Heat activated color changing mugs are microwave safe, but not dishwasher safe. Hand wash only. Don't soak. • UPG is a novelty gift company specializing in smart and funny gifts. Check out our shop for all types of quirky fun stuff!

The Planet Mug: Pore over your pour-over! This mug features beautiful original portraits of our solar system, and every time you enjoy a hot cup of coffee or cocoa, you can learn about each planet. As 19th century astronomer Maria Mitchell wrote, "You cannot study anything persistently for years without becoming learned..."