Situation: I am standing to the right of the table in the middle of the room facing the blackboards.
Alternative situations: I am standing on the right side of the table in the middle of the room, the chair is to my left, my left hand is on the back rest of the chair as I squat down. I ate my lunch at the table in front of me and behind me were two tables.
Question: What is the object on the wall that you write with a chalk?