The Battersea Cauldron is displayed during a preview of 'Harry Potter: A History of Magic' exhibition at the British Library, in central London on October 18, 2017, marking the twentieth anniversary of the publication of Harry Potter and the Philosopher's Stone.  / AFP PHOTO / NIKLAS HALLE'N / RESTRICTED TO EDITORIAL USE - MANDATORY MENTION OF THE ARTIST UPON PUBLICATION - TO ILLUSTRATE THE EVENT AS SPECIFIED IN THE CAPTION        (Photo credit should read NIKLAS HALLE'N/AFP/Getty Images)