Situation: I am sitting on a chair in the middle of tables with chairs that are also in the middle on both sides of mine.
Alternative situations: I am sitting on a chair that is on the right side in the center of the room facing the table in front of me , wondering how I ended up here in this room. I am sitting on a chair at the table and there is a chair behind me.
Question: How should I move to pick up the backpack?