#cat shelves

tbh i’ve been seeing way too many ppl stress about their cats’ mental stimulation lately and it got me thinking. imo shelves are way underappreciated but i’ve also seen some wild cat tree setups that look like engineering marvels. like what even is the cutoff where a shelf becomes a vertical jungle vs a tree becoming a fire hazard? my two cats either ignore the shelves or fight over the top branch of the tree so idk if i’m doing it right. anyone else have a hybrid setup or just let the cats do their own thing? 🐾