Situation: I am standing behind a black chair to pick it up while I am facing the round table.
Alternative situations: I get up a moment to take a break from reading and look at the table that is behind the chair behind me to realize how many papers are left to read. Standing behind the chair, while looking over the shoulder of my coworker in the chair.
Question: What feature is different about the chair I am standing behind compared to other chairs at the same table?