The first chair

Every once in a while, I see an article about how sitting is apparently terrible for our health, which makes me think about why and how it came about that we sit.

Humans sleep lying down, so you can see how we would stumble upon the notion of sitting as a transition point.  Early fires would most likely be built on the ground, so you'd have to sit to tend to or use or enjoy the fire.

When you visualize people sitting around a fire, they're often sitting on rocks or logs.  And you can see why a person would rather sit on a rock or log than on the possibly-damp probably-dirty ground.

And before we had furniture of any sort (including tables), it was probably more convenient to sit on the ground to do things like make clothes or butcher animals than it would be to stand up.

But then someone thought of tables for whatever reason (maybe things were cleaner when not at ground level even if people hadn't invented cleaning yet? Maybe vermin and animals couldn't get at stuff as easily if it was up higher?)  And then someone thought of the idea that it would be more comfortable to sit when working at the table than to stand, and figured out how to build a device to make that happen.

This has me wondering what the ratio of time spent sitting vs. standing was before we had furniture.  People had to stand to hunt or to farm, although they probably sat for things like meal preparation and making tools.  Which did they perceive as the default?  Did they make chairs to use at tables so they could sit like they usually did?  Or did they originally feel that table use was standing like they usually did and then make chairs for some other reason?

Or did they first make non-table chairs (whatever the early equivalent of couches or armchairs was) and then come up with the idea of using chairs at tables (or even the idea of tables) later?

Have there ever been any cultures where people didn't sit, at all, ever?  Have there ever been any cultures where they sat but didn't use chairs?  (I have the probably-stereotypical idea absorbed from the ether that they tended not to use chairs in Japan before Western influence.)

I also wonder if there have been any cultures with different postures that had their own furniture (i.e. not sitting, standing, lying down, kneeling, anything we have a verb for in English) but are now lost to history.  Or maybe they're not lost to history, I'm just ignorant of them.