If you can't beat them, join them. So if you can't get your cat out of all the cardboard boxes that come to your home, embrace it and build your animal a fort! At least that's what other cat owners are doing. Yes, you will probably have to do all the work alone while your kitty watches you with judging eyes, as if asking why are you taking so long, but after you complete the construction, the critter will have a place to call its own.