Situation: I am picking a book from a bookshelf with an armchair on my right and another bookshelf on my left.
Alternative situations: I am looking for a book to read on the bookshelf on the left of room to read on the couch to my left. I am looking for a novel to read from the bookshelf to the right side before I sit on the arm chair on the left side of the room.
Question: How many seat cushions does the couch have behind me?