Situation: I am sitting on a chair facing the desk with a trash can on my left.
Alternative situations: I am reading a story book while seated on the chair on the left side of the bookshelf. Sitting on a chair and looking at the desk behind me, I am wondering who owns the bag in my ten o'clock direction, while my own bag is on the floor in my 8 o'clock direction.
Question: What allows sunlight to come in to the room to my left side?