A lot of excited little feet ran up and down those stairs. Think of the fashion changes from 1909, turn of the century, Victorian dresses thru the 1970s polyester and bell bottom jeans. I bet they held war bond drives and collected metal for the war effort in the 1940s.
Our old grade school had lines on the blackboard to learn penmanship. No one teaches cursive writing anymore. We old people now use it as a secret code to each other.
I do remember the days of blackboards. Every couple of days, the teacher would choose someone to go outside and beat the erasers on the rocks to clean them. I betcha that long 2 x 4 on the right wall held a pull down map of the world. I'm also seeing an old Pioneer tape deck circa 1970s on the floor.
Eldo, air flow/movement was the name of the game in building climate control before the new more efficient systems came into being. This is why there are transoms, high ceilings and lots of windows.
It was a set up attack the substitute teacher was involved. She held me and my attacker back at the end of class. Then sat there with a smirk on her face until I asked what she held us back for then she got up and walked out. The boy attacked me yada yada yada got me in a headlock under his left arm and dropped to the floor. After that I couldn't move. We were in the county children's shelter together. I think most there was 6 or 7 of us from the shelter in that class. It was 1st grade. He had been recruited to do this to "toughen" me up. The reason is the people doing this assumed I was being too fearful of fighting not recognizing that I was being defiant in refusing to do anything they wanted me to. It was the only way I could resist/fight back against the abuse I dealt with 24/7.
Turns out I recovered movement.