The Unemployed Philosophers Guild Heat Changing 2013 Constellation Mug is a unique and collectible item that features a pattern of constellations on its black ceramic surface. With a round shape and a capacity of 12 oz, this mug is perfect for enjoying hot beverages. The mug also includes a special feature of heat changing constellations, adding a fun and interactive element to your daily cup of coffee or tea. This original and licensed reproduction from The Unemployed Philosophers Guild is a thoughtful gift for all occasions, especially for those who appreciate star-themed items.