Situation: I am sitting on a chair by the short end of the table while having another chair behind me.
Alternative situations: Standing on top of the head of the table so I can get a better look straight at the whiteboard. Resting with my head on a table, I notice a mistake in equation on a whiteboard in front of me, while there is an office chair in my 4 o'clock direction.
Question: How many black chairs are not at the table?