Situation: I am sitting on the shorter bookshelf with a few trash cans on my left.
Alternative situations: I am facing the chair with my hand on the back rest and looking at the table. I am standing with a bookshelf right behind me and a chair in front of me at 1 o'clock, another chair in front of me at 11 o'clock, and a trash can behind me at 7 o'clock.
Question: How many shelves are there?