My kittens grow up. They love chasing each other. The original cat tree is not enough. So I went to IKEA to find some items that can be made into a cat trail.
If you look at the picture below, you can see a door knob has been lost. Because they are so energetic that they damage furniture.
The following photos are the production process. The process is very simple, you should be able to understand.
The boxes are fixed to the wall with a drill and silicon. However, my cat has interfered with my work and I did not get to take pictures of the setting up, so I took a picture of him lying on the drill box.