Situation: I am choosing a book from the bookshelf with no bookshelves behind me and the door in my nine o'clock direction.
Alternative situations: I am looking for something on the bookshelf. There is nothing behind me. After leaving my jacket on a table in my ten o'clock direction, I am looking for a book to read, while there is a door on my left.
Question: What are the bookshelves in front of me made off?