I dislike cats. No, make that I hate cats. Unless they don't belong to me, look very cute and are absolutely clean. Otherwise, I would never rear cats because they are so much work. Who has time for pussies when I have kids of my own to deal with?
So, I seriously have not heard of cat trees. Do you know what is cat trees? You do not know too? How about checking them out by look at the link I gave?
LOL, it iturns out to be some wooden shelves which your beloved kitty can climb on. It is not some trees for the cats to pee. Oh wait, cats don't pee like dogs, do they?