What would Plato say?

When we went to pick up Leo from school today he wasn't quite ready to leave yet because he was still playing with blocks, so I grabbed the only adult-sized chair and settled in to wait for a bit. After a minute Leo looked at me and said reprovingly, "That's not a librarian chair, that's a teacher chair." I asked if that meant that I had to get up but if Papa could sit in it. Leo said, "yes, because Papa's a teacher."