The house for four people was designed for the Togni system of lightweight prefabrication, made out of section irons. It is made up of three rectangular cores -the bedrooms, the living room, the kitchen-dining room linked by a corridor of irregular that variable form a new element in design that breaks down the rigidity of the layout. Moreover the cores are of different heights the living room is higher than the bedrooms and kitchen: in order for the house to maintain a constant profile at roof level, the profile is variable at ground level; the difference between levels in the interior produces a pleasing effect.