this is some kind of spaceship or something.
You know, quiet books. No? You don’t?
Come on, I think I at least had a quiet cube when I was a kid. It’s a way of entertaining small children while at the same time teaching them the basics of clothing fasteners. So probably something that Petunia Dursley would never have allowed Harry to have, which is probably why Julie, nerdy quiet book creator extraordinaire, made one just for him.
Instructions on how to make one for yourself are available on Etsy.