@futurebird Fascinating story. I too worked in the Rare Book Room as an undergraduate. My job was to fetch books from the stacks in back and bring them to the head librarian who would turn pages for the visitor. That back room with the books was very secure. If a book was chained to a shelf then I needed to get the key custodian librarian. Otherwise, I was alone; it was a little unnerving to hear a muttering voice back by the oldest books. I never found the source of the voice.