Amazon.com offers The Unemployed Philosophers Guild Heat Changing Constellation Mug for $15.95.
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Pour a hot cup of coffee and 11 constellations emerge before your eyes. 10 ounce cup Microwave safe, not dishwasher safe. Includes: Cassiopea, Perseus, Sagittarius, Hercules, Andromeda, Scorpius, Taurus, Ursa Major, Ursa Minor, Orion, Castor Pollux