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!

Banned Books Boldly displays the title of some the world's most famous banned books. From Galileo's Dialogo to Rushdie's Satanic Verses and 22 titles in between.

Butterflies Mug Pour hot water to see colorful butterflies appear. Cool silhouettes transform into classic naturalist illustrations. Our heat-transforming mug reveals 18 different species (common and Latin names on the bottom). Witness a beautiful metamorphosis every day!

Dino mug shows a prehistoric landscape populated by fierce dinosaurs. When you pour in a hot beverage, the eons pass before your eyes as the dinosaurs transform into fossils in a museum exhibition.

Great Gays: When the mug is empty, it shows fourteen closet doors. But when you pour in a hot beverage, 14 of the world's most famous gays proudly emerge. Includes Michelangelo, Michel Foucault, Freddie Mercury-see the product description below for a full list!

Great Nudes of Art:  Add a hot beverage and everyone's clothing disappears. Featuring 13 works of art from the 15th to 20th centuries.

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..."

Star Trek: When you add hot water, Captain Kirk, Mr. Spock, Lieutenant Uhura, and Dr. McCoy leave the Transporter Room on one side of the mug and materialize to explore the planet surface on the other side of the mug. Energize!