Situation: I am standing beside a table with the trash can in my six o'clock direction and the window in my three o'clock direction.
Alternative situations: Reading the message on a whiteboard, I am holding on a table on my right, while there is one more table in my five o'clock direction. I am standing by the table on top left of the room, left side of table , reading the words on the whiteboard that is in front of me.
Question: How many trash can are behind me?