Situation: I am emptying a trash can with a bookshelf behind me.
Alternative situations: I am throwing out my gum wrapper in the trash can located on the top left corner of room, I can see the window to my right. I am changing the bag of the trash can located on top left corner of the room.
Question: The book I am looking for is not on the bookshelves behind me so what direction should I look go to keep looking for it?