Some elastic, a board, brackets and a stapler are the essential elements to this remarkably simple bookshelf project. In short: this is made of stuff that many of us already have on hand or can purchase inexpensively at any hardware store.
The result: a book shelf that holds as few or as many books as you want quite easily, appears to ‘hang’ them impossibly above and does no damage to your favorite volumes. Books are also easy to add to and remove from the finished wood shelf.