Pour in your favourite hot beverage and watch as Hogwarts appears from the darkness. This wonderful Hogwarts Heat Change Mug captures the wonder of Hogwarts School of Witchcraft and Wizardry, allowing you to enjoy a magical tea-break. This standard sized mug features a decal that changes with the heat. When cold the mug is black, with just the Hogwarts crest and some candlelit windows visible. However, once a hot cuppa has been made, the moonlit buildings of this famous school appear from the darkness. The perfect gift for any Harry Potter fan, the Hogwarts Heat Change Mug offers you a great mug from which to enjoy your next mid-film cuppa. First published in 1997, J.K. Rowling's bestselling series of novels following the magical adventures of Harry Potter, Ron Weasley and Hermione Granger has since become a cultural phenomenon. A huge success in novel form, the world of witchcraft and wizardry was then given big screen treatment in 2001, launching one of the most successful blockbuster film franchises in cinema history. Harry Potter is instantly recognisable to millions of people across the world, and is hugely popular among fans of all ages. The Hogwarts Heat Change Mug is an officially licensed Harry Potter product.