In the LB7 bookcase produced by Poggi (1956), we find all the principles discussed at length by Albini on the theme of the lightened upright (from the 1940 Scipione Exhibition to the 1956 Olivetti store), which in this modular system becomes a light structure, between the ceiling and floor, designed to mark the development of a mobile wall, a virtual diaphragm for interiors. In fact, the uprights, fixed by pressure between the floor and the ceiling, offer a range of adjustment ranging from 268cm to 290cm, while a series of holes allows the possibility of placing containers and shelves at various heights, being also able to expand longitudinally in the space, with a module about 90 cm wide. Subsequently, a self-supporting version was also designed, without the ceiling attachment system, also produced by Poggi with the name of LB10.