Situation: I am sitting on a chair and there are three other empty chairs on my left and a bookshelf behind me.
Alternative situations: Taking a picture of the notes on the whiteboard while sitting in the fourth from the left chair. I am reading a novel while seated on the fourth chair to the right side of the door, there is a bookshelf behind me.
Question: If I change seats with the person on the end of the row on my right , how many seats will I move?