Polish up your wit, wisdom and learning as you sip your morning brew in this charming color-changing Harry Potter mug. The black and blue mug with gold accents features the Hogwarts School of Witchcraft and Wizardry crest surrounded by stars, with faceted images representing the four house mascots - lion, raven, badger and serpent. Pour in your favorite hot liquid to see the Ravenclaw raven magically appear on the back of the mug.