I'm going to try the upside down pot idea, I received 4 catts that have grown out of the current pots, So I will cut off that part and attach to a clay pot...Also what do you think of lava rock vs pine bark for catts??? I have read a mix of opinions in the forums. I am in the Piedmont North Carolina, so my catts can play outside during the summer, but I would be bringing them in for the winter. would have to have a hanging area and lights- thinking out loud- love to receive suggestions!