The ghosts are animated for the Pottermore website which is the complete 'digital heart of the wizarding world' from JK Rowling. The feature gives a guide to the ghosts that haunt Hogwarts from the four houses; who they were, how they died and a frightfully interesting fact. Learn how The Bloody Baron murdered The Grey Lady then took his own life, or how Nearly Headless Nick was sentenced to death after a magical spell went very wrong. See the ghosts.