I thought this outdoor cat den was a unique way to let your kitty get some fresh air and stay safe at the same time. I saw this enclosure up close recently at a convention. There were 3 cats inside, all relaxed and looking perfectly happy. It didn’t seem much like a cage.
As a side benefit to this sort of thing, your local songbirds would have some protection from Kitty’s natural predatory instincts. In Florida, this would mean lizards and snakes as well. I know my grandkitty Throckmorton is a great huntress; my son and daughter in law are constantly saving small creatures from her clutches.
For cats that end up indoors all the time, this would be a great improvement. I especially like the hammock! What an enhancement for a lazy cat life this would be.