This modular bookshelf was designed for people with an affinity to design, who are frequently moving and changing their living space. Without the need for screws and tools, the individual shelf units can be removed, altered and expanded in only a few steps. Precisely manufactured shelf boards made of non-toxic laminated birch wood in combination with the back wall form a solid module. These modules are connected by a system of mortise and ball-shaped steel tenon joints. A variety of optional sliding doors of different materials offers visual diversity.