Doesn't stop mine they want the kitchen window view.

At least they won't shit on it. One far corner of the basement the two bastards would, even after adding another litter box instead of fighting cat behaviour.

They treat the patch of foil like the Berlin wall, constantly probing it for weaknesses, gingerly walking on it. Hoping against hope that they can shit 6 feet away from their litter box on the carpet again as cat god intended. Occasionally I replace a piece they've mangled enough to create a small gap which gets me worried.