Situation: I am sitting on a couch while there is a pillow on my left and a shelf right in front of me.
Alternative situations: I am sitting on the couch while looking for a book to read on the shelf in front of me. I am sitting on the short end of a couch and facing a shelf with a plant behind me at 5 o'clock.
Question: Which direction should I go if I want to turn on the lamp?