Situation: I am sitting in the lower right corner of the last chair and behind me is a projector screen. There is no chair to my immediate right.
Alternative situations: Sitting at the table to the far right facing away from the projector screen. Just pulled down the projector screen behind me and stepping from an office chair on a floor now, pushing away the office chair in my 8 o'clock direction.
Question: What is in front of that has a flat surface area?