Situation: I am sitting on an armchair with a bookshelf on my right and an armchair behind me.
Alternative situations: I am sitting on the brown armchair facing the black couch as I sip my cold coffee, the bookshelf is to my right side. I am enjoying a cup of coffee sitting on an armchair facing towards couch with no backpack.
Question: Is the arm chair I am sitting on , the same or different as the one behind me?