DOMUS was created to be a system that reinvented, modified and transformed the walls of the home, allowing them to contain, display, hold, light, protect and exhibit objects, assuming any desired form and image.   DOMUS could be used as a bookshelf, exhibition cabinet or shelved wall; it represented a new way of conceiving a system. 
Antonio Citterio, thought of a series of elements that could work in many ways, which could be used for different purposes, variously organised amongst themselves, thanks to a patented mechanism developed by the B&B Italia Research and Development Centre, as well as an innovative design of wing shelves with optional lighting.
A series of elements that could be used individually or in multiple compositions, giving rise to completely different configurations.  The idea was conceived not in order to create a formal differentiation as an end in itself, but rather as an opportunity to resolve individual problems with custom-made solutions.
This is what gave rise to the focus on useful functions, in response to individual requirements.
The design started off as open research on two fronts: the catalogue of functions and elements designed as volumes in space.
The architectural approach (volumes in the living space) tipped the modularity from the vertical to the horizontal; it broke the concept of the door, moving the attention to the surfaces (glass doors and panels) designed to operate as mobile closing or protecting elements, to be adopted based on the individual requirements and to be modified during use; it transformed thickness into volume by equipping the tops of vertical containers; it resolved with great simplicity the idea of custom-made sizes, by creating overlapping vertical containers and shelf back panels. 

Further information

> ANTONIO CITTERIO designer sheet