CAVE is a unique bookcase designed by Sakura Adachi which also doubles as a comfortable reading lounge  with in-built reading lamp. The Cave bookcase provides a private reading space within its form. As a seat  height is just above the floor, CAVE gives a feeling of hiding from others standing around it. Books can  be stored on both sides. Therefore, CAVE can also functions as a partition of a room. Check out the  pictures.

The inverted bookshelf turns a bit of your living room upside down as it hangs all of the books from the bottom instead of supporting them from below. It's a satisfying optical trick and doesn't damage any of the books. In fact, you can take books in and out of it whenever you.