Warm up your morning routine with this color-changing Harry Potter mug that features the Hogwarts School of Witchcraft and Wizardry house crest design amid shiny gold stars. The black and red ceramic cup displays the faceted images of all four house mascots on the front - representing Gryffindor, Hufflepuff, Ravenclaw and Slytherin - while the back image of the Gryffindor lion magically appears when you add hot liquid to the mug.