“Pottermore was “an online reading experience unlike any other,” where readers could participate in Harry’s story themselves. People who signed into the site could take a quiz written by Jo herself that sorted them into one of the four houses of Hogwarts. They could choose a magical pet and be chosen by a magic wand. The site was also full of extra information that Jo couldn’t find a place for in the books themselves. For instance, she filled in information on characters’ early lives before they made their appearances in the books. The site also had artwork showing scenes from the books—down to the last detail. Jo supervised everything so that it would look exactly how she imagined.”