Situation: I am sitting on a chair, while having another chair on my left and a bookshelf behind me.
Alternative situations: Just took a book from a bookshelf behind me and am reading it now, while there are more books to sort out in a box in my eight o'clock direction. I am sitting in the chair reading a book and in front of me is a table, while to my left is another chair.
Question: How many chairs can I see?