I found this beautiful hanging book shelf system from a French online design shop called Design De Collection. It is a bookshelf called Piegato by German designer, Matthias Ries. It is a “laser cut and powder coated sheet steel delivered almost completely plain, which results in a simple and cost effective transportation. The customer then bends out the required amount of shelves from the plain and mounts the hole rack with just two screws in a few minutes. Due to the environmental friendly production, the freight size and the recyclability Piegato also holds a brilliant ecological balance.” It can support approximately 9 kilos.