We have a special "chair" that the cats fight over,near the window right in the sun. We'll have full out pushing biting deathmatches. I put another chair identical right next to it so they could each have one. They like the original chair better, both of them - more cat odors on it I guess. The 2 chairs sat empty so I took the chair I added away and they fight over the 1st chair again. CATS!