Mr. Gorbachev, tear down this wall!

Humans have weird litter-boxes. I see any nature call as an opportunity to mark your territory and stamp your authority. To accomplish these and more, the litter-box must be in a fairly accessible place. It's one of life's great joys to ambush a creature, who shall remain Nathan, during the act. We, the cats, have been denied this pleasure by humans. Pha, for example, has a door outside his litter-box which he closes each and every occasion. The time spent inside causes worry and suspicion. The lack of sandy pellets is quite bothersome. I need more mammals to bug and pha so deserves to be the next candidate.