I've got two cats at home who live by this motto. Currently, there is an empty toaster oven box on my kitchen floor that is the preferred sitting/sleeping location of my older cat. And sometimes, her little brother wants it, and there's a little bit of a fight. Cats love anything that they can squeeze themselves into. Honestly, there's lots of times that they don't quite fit, but go ahead and sit anyway.
Here's my cat Maizey, forcing herself to fit in a basket at my house. 16 years old, and this is how she spends her time. Trying to fit in things. She sat like this for the better part of an hour.