I've seen one in the shape of a cactus that was made of rope (at least I think it is). It looks quite sturdy and this one handles 7 cats. And I guess if the rope is frayed, you can replace it. https://www.youtube.com/watch?v=CEZI1vbMJT0
Clacks-Overhead: GNU Terry Pratchett
"Magic can turn a frog into a prince. Science can turn a frog into a Ph.D. and you still have the frog you started with." Terry Pratchett
"I will not yield to evil, unless she's cute."