Blame Kurt Harden at Cultural Offering. He began the shelf revelations game.
These are some of my book shelves. I've avoided showing the stacks in my office or the steampunk library room where the books are on tall metal storage carts that have wheels and which can be easily moved around. While highly functional, those are less attractive than the ones in this room.
Since the modern Twitter game is to look for volumes that offend, I can save time by noting that the Historical Dictionary of Fascist Italy may fit the bill.