J.K. Rowling’s Pottermore is built around “Moments” in which you can click and discover new things to collect, read, or simply play with. On the Pottermore Insider today, the creators offered details on how they create one of these experiences.

In this write up they use the Magical Menageria Moment they’re developing for Prisoner of Azkaban as an example. They began by explaining how scenes are chosen. “In order to provide a faithful companion to the reading experience without replicating each and every passage from the books, we select key or interesting scenes from the stories to depict on Pottermore.com.”

Continues The Insider, “Each potential scene is weighed against various criteria, from its relative importance in the narrative to how it might look when visualised and whether it lends itself to the inclusion of interactive features and content. We also like to highlight scenes that were omitted from the films, or those where the film depiction differs from the books.”

“With its cage-lined walls and the ‘squeaking, squawking, jabbering or hissing’ of their inhabitants, the Magical Menagerie Moment was selected because it is described so vividly in Harry Potter and the Prisoner of Azkaban. It provided an opportunity to introduce a new location and a narrative moment that was not shown in the film. It is also our first introduction to Crookshanks.”

We like that they give moments not seen in the films a chance, because it allows these scenes that Rowling wrote up to finally see visual daylight.

You can visit Pottermore’s site to continue to learn about the creation of a moment. Pottermore released Prisoner of Azkaban chapters one through seven on December 20, and another batch of chapters are due out in the next month or so.

In related news, Pottermore announced today that you can now connect your Book of Spells video game to your Pottermore.com account, which will let you use the wand you’re given on the site for use in the game.