Welcome to this very strange question about bedroom furniture. We've all seen the round bed in Austin Powers, and novelty beds can be round. In my Renaissance-type Earth-like world, I wanted all the beds to be round in a particular country and I started looking at beds historically.
Yep. I've been researching the SHAPE and design of beds in both the ancient world and the modern and I now know far more about the standardization of mattress sizes than any human should.
For various SOCIAL reasons, I want the beds to be round and large, even for the poor. So, constructing them AS round needs to be easy to do and accessible for everyone. It needs to make sense on a practical level. The problem is that square and rectangular beds happen for a reason, as does most square furniture. My question is, what natural conditions or materials can we create that would make the building of round shaped furniture, in particular beds, more practical and likely than furnishings with right angles? It's easy to put it down to social and religious causes. I have those and that will create some pressure, but I would like some more practical construction-related reasons for it.
Users are smaller than humans, but pretty humanoid. They only weigh like 30-40 pounds as adults, and while they aren't cat-flexible, they do like to curl up. Families are large because young are born in litters--so many families will have a dozen children. The culture tends to be more clean and hygienic than standard humans.
I'm open to making minor changes in the world like adding plants/trees that make this easier.