A cat will claim any box as their own, no matter how small it is. And no matter how big they are. Yesterday I placed this tiny box on the floor and Phoebe was all over it like gravy on cutlets. And she sat in that box in the middle of the kitchen floor for over an hour.
She's got that "I'm pooping" trance going on, doesn't she? Thankfully, that was not the case. She was just annoyed with the camera. As usual.