During the first few days of living with Chani, Chris noticed that she always liked to be high up. She would climb up to the highest point in the room and just perch. At this time, I did not have a cat tower for her. That changed pretty quickly.
Now, this tower is usually her throne. However, occasionally, 9 will try to take over the throne and Chani retreats to the top of the tube that makes up the tallest point of the tower. It's not the most stable, but at least she's above 9. And it provides an opportunity for 9 to bat at Chani's tail.
Sometimes, during the day, though, they just take a nap together in the lounging area. It's cute. And a great photo opportunity.