We're totally digging the new extendable REK bookcase, by Rotterdam-based designer Reinier de Jong.

REK is a bookcase that grows with your book collection. The more books, the bigger the bookcase. The zigzag shaped parts slide in and out providing as much space as needed. Regardless of the quantity of books REK will always be full.

Also with the different spaces that appear you can arrange your books according to their size.

The five-part bookcase is finished with white high-gloss laminate on the outside surfaces, and warm grey stain laminate on the inside. And this is no one-off concept that will never see the light of day--you can order one right here, if you've got 5,500 Euros.

Ironically, the only way I could afford one of these is if I were to sell all of my books. Man, if O. Henry was putting together a gift guide....