Kitty is wearing a harness, I think the harness is tied to the rail and the cat was posed.
I was kinda just joking. :^)
It’s actually really pretty funny.
Maybe and maybe not. Look up Mochi and Marshmallow on YouTube sometime...Mochi not only sits on her rump like that cat is, she preferred to nurse her kitten while sitting thusly, rather than laying on her side like most momma cats.