If you have many books, or something small, you can use Simple Shelving System Design. This is called Leaning Shelves and designed by Voos Furniture, it was made of reclaimed redwood, salvaged from a dismantled water tower in New York.
Simple wood planes are joined without any screws or hardware. Leaning Shelves measures is 78″h x 12″w x 9″d and priced at $750. I think this prices not high enough. It’s right prices for cute design like this. You can check Leaning Sheves Photos on this below.