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.