I have called it a mini-catio. Let’s just say it is a way of letting full-time indoor cats enjoy a bit of outside time to smell the air in safety. It will be easy to set up and cheap to buy. I don’t like the thought of full-time cats being banged up in what is effectively a prison or a zoo without some outside smells. Even zoos give their animals that pleasure. There is a lot of pressure of cat owners who keep their cats inside all the time for good reasons to do their best to make the artificial environment as stimulating as possible for the cats.