Vigo Russel _ Pinch bookshelf. The composition of these boxes works really well together. A trend I have been seeing lately is in fact this stacking of boxes.
MDF _ random
By attaching the bottom book to the L it looks as if the books are magically attached to the wall.
Featured once before.. The bookshelf "foundation" by Hubert.
I saw this bookshelf for the first time looking through a magazine when I was at the dentists. This is "Nova" sold at Bolia in Sweden.
Muuto has a nice collection and one of my favorite items is their bookshelf "stack".
A more well-known bookshelf from Ikea. This is "expedit". They also have a collection of boxes that one can combine.