Situation: I am changing the trash bag and there is a shelf hanging over my head.
Alternative situations: I am reaching on the top shelf to find a mug so that I can make myself a coffee on the counter in front of me. After picking up some drafts from a copier in my four o'clock direction, I am cutting them into a trash can in my eleven o'clock direction.
Question: Is the window in the corner or the middle of the wall?