The back wall is built by similar square components some of which are open, some closed. Without distorting the formal structure, the articulation relieves re-petition of monotony, an effect which is strongly accentuated by the light setting. In balancing mass and void, the effect of the heavy wall needs freedom to expand. Consequently none of the objects are placed in the middle of the room. The spatial contrast between open and narrow which is experienced when coming out from the entrance enhances the impression of freedom in the area.