Our younger cat is a strange one! One of the things he loves to do is lie on his back, paws hovering in the air. We can't look at him without fighting the urge to snuggle that white fuzzy belly!
He also loves our battered old armchair. He'll lie on his back, head
hanging off the edge. Slowly, slowly, he head dangles farther and
farther off the edge, until either the weight of it drags
the rest of him down, or he finally shifts.
I think it's the tail curled up on his belly that does it for me in this photo!