In urban life, there seems to be a common understanding that people tend to consciously or subconsciously become wary of strangers surrounding them. They are always balancing a certain level of privacy with others. A bookcase CAVE provides a private reading space within its form. As a seat height is just above the floor, 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.