The Lihit Labs team is the creative minds behind the commercial book end, a clever, but interesting booking, so that individual books can stand for themselves. Instead of two parts at the opposite ends, it is a single long piece that is made with a stopper in the teeth, which can be turned up.
In this way it doesn't have to lean against other books to keep it upright. By removing a book, they would not impair and remain upright. The stoppers are the main component here because it flows down again if no book can be pressed up. As soon as a book has been removed from its place, the raised stop is noticed.
Photo credits: Lihit laboratory