Situation: I am sitting on the bed watching TV with my feet on the suitcase.
Alternative situations: I am on the floor leaning on the bed behind me on the left side of the room as I watch a movie on the TV in front of me. I am taking out my pajamas from the dresser in front of me so I can wear them to sleep on the bed right behind me.
Question: What is the difference between the lamps in front of and behind me?