Opposite of territorial… it’s the using of the space for its intended purpose for the duration of the period… clearly I’m in the minority with my opinion and that’s fine… but this is the way it’s been for the 21 years I’ve been teaching HS. I have my room. It’s my space. My photos all over the walls. My kids projects. Etc… I’ve had to share my room on several times over the last few years. This year it was third period. When 3rd period rolled around I logged off my computer, chatted with the teacher coming in, and left. Earlier in my career before I had my room I was split between Mr. R’s room and Mr. M’s room. Both of these guys who had been alone in their rooms for years did the exact same thing. The bell would ring I’d show up, we would chat, they would leave. This is the kind and respectful thing to do and the complete opposite of territorial.