Situation: I am working on my computer and there is a whiteboard behind me.
Alternative situations: After stacking the stack of chairs that is on my 4 o'clock , I returned to work on my monitor in front of me. I am standing bottom left corner of the table trying to speak while people are listening to me on the people sitting on chairs in front of me on either side of the table.
Question: What are flat and standing upright on top of the table in front of me?