On the actually-built side of things, these cardboard bookcases put round into practice. The spaces created within them are somewhat challenging from a functional standpoint but visually they are very impressive. It goes back to the age old furniture question: do you design with a function in mind or let users figure out their own functionality?
I've always dreamed of having a real library (an entire room dedicated to books and reading). My books are spread throughout the home, some on shelves, the rest in precarious stacks on the floors. I'd love to have this library.