Remember grade or elementary school? It was probably grades 1-6 or maybe 1-5. Chances are you arrived in the morning, went to the right room, and aside from recess, lunch, and gym, stayed there for the day. So did the teacher. Maybe there was another person who came in for music or art once a week. But it was a one-room thing with a class of similar age and one teacher who taught all subjects, save a couple.
The interesting thing there is how simple and normal it seems. And that a change at grade 6 or 7 is also considered normal. See, all the kids in the elementary classes are expected (or at least used to be - no idea how it is now) to keep up more less together. And one adult was all it took to teach a class, even with varied subjects. One adult could handle it - and kids were expected to be able to as well.
Yet at grade 6 or 7 things changed. Junior High, or Middle School, depending on where and when one went to school had a different form. No more staying in one room, now it was shift around every hour or so. Sure, there was this concept of a "home room" but it really meant nothing. That was just the place one started the day and passed a bit of time before the real classes started.
Now, the kids moved from room to room, but the teachers pretty much stayed with a room. A teacher had a room. A student had a locker. Unlike before when the kids and the teacher shared the room, and each had a desk of their own. It went from a feeling, if false, of ownership to a timeshare.
Also, the teaching was distributed across several adults. Yet the learning was still done by a student who was expected to keep up with all of it. Ponder that for a moment. What does it say? It says, when thought about, that the kids are expected to keep up with a range of subjects even though no adult teacher is expected to. Okkay, nice compliment for the kids, but rather damning of the teachers, isn't it?