Ok now, a cat article I love!
http://www.lamag.com/culturefiles/cat-patio-catio-king/
clip:
The Catio Is a Patio for Your Cat Because You Win, Cats. You Win.
Humans clearly no longer the dominant mammal on earth
July 24, 2017 Cole Kazdin Animals, Architecture
Chris Preston believes that in order to build a superior catio, you have to think like a cat. “I know what cats like,” he says. “I know how they think, I know what they want.”
What exactly does that mean?
“They want to be up high, they want a bed to lay in and they don’t need a lot of space. They don’t need to run around like a dog. They chill,” he says, lingering on the word.
A “catio,” if you haven’t already figured it out, is a cat patio, and Preston, with his insight into the feline mind, is the self-proclaimed, “Catio King.”
End of clip/but there's lots more description with ideas and some handy photos...