Hidden bookshelf. Perhaps the world's smallest, least space-saving, lightest bookshelf. We would love to see the covers of some books. 25 books can be placed. There are 5 piece in the box. Each piece takes 5 books. If you want, we can put 5, 10, 15, 20 and 25 books. It is mounted on the wall with a strong adhesive tape. For double-sided tape to work, your wall needs to be flat and smooth. Height: 51 inches / 130cm It will not damage the book. It is useful and functional. The design is based…