Dutch designer Gerard de Hoop created Frames Wall as a wall-mounted shelf suitable for books or any other trinkets you may have. The design is made up of square- and rectangular-shaped spaces that make it easier to store books made of various heights. Not all book sizes are the same so why should the shelves be?
The stacked frames are three deep with space in between giving the shelf visual interest and a lightness about it.
He also has a matching freestanding bookshelf called Frames.