I decided to make a bookshelf in which books fanned out like the voussoirs (the wedge-shaped stones) that make up a stone arch...There were a couple of problems that had to be overcome. Books are not wedge-shaped, so they will not fan out neatly into an arch like voussoirs do without some help. And I needed to find a way to stop all the books in the middle of the shelf from sliding down to the sides if someone took a book out from one of the ends. I realised I could solve both problems but fixing angled bookends at regular intervals along the shelf. However, rather than spoil the impression that the arch was entirely made from books, I disguised the bookends to look like dummy books.