human
I need to find out how to make a DIY cat tree.
assistant
One way to make a DIY cat tree is to use an old bookcase or similar piece of furniture. You can remove the shelves and replace them with climbing poles for your cat to explore and play on. Make sure you secure the poles at the top so your cat can't get stuck, and add toys and scratching posts to keep them entertained. If you're looking for something more permanent, you could build a custom structure with different levels and platforms for your cat to explore.