A week ago Friday my husband came home from work after stopping at Walgreens. He had picked up a few things for himself and had added a pop up house for the boys (Cadillac and Pontiac, the cats) This simple cube has portholes on three sides and a couple of catnip infused streamers. Cadillac went nuts, won't let Pontiac near it..... Still. Cadillac sleeps in it and Heaven help you if you try yo move it. When Pontiac walks nearby a paw reaches out and swipes at him. Hours of amusement for the entire family.