Situation: I am facing the door and the side of the bookshelf is directly behind me and the door that is closer to the door I am facing is in my eleven o'clock direction.
Alternative situations: I headed out of the door and the bookshelf was to my right. I have just opened the door on the left side of the bookshelf to allow more fresh air into the room.
Question: When I turn around what is behind me against the wall?