Mr. Purrcy can't pass a box without checking it out. This is what I call his "kitty play pen". Everyone morning when I open the door to my studio, Purrcy will look for an open box. I usually have one since I use these plastic boxes to carry all my class supplies to the store when I teach. I throw a mouse in there for him and he will bat it around and finally toss it out. After that he runs around the studio chasing whatever paper scraps he can find then will settle down for one of his many cat naps.