The program has been divided up in two areas. All the public areas and the master bedroom share a continuous plan of polished concrete within a single, delimited space. Below this level, a number of spaces extend that basic unit according to specific seasonal demands, thus enabling the house to contract or expand. A significant feature of the design is the vaulted concrete membrane that covers the upper floor, hovering over the open plan where social activities take place. The vault is an element that has been present in the vernacular architecture since long ago; 20th century architecture re-elaborated it during the 50’s and ‘60’s because of its constructive qualities and efficiency. The project recovers the vaults as long, folded concrete beams that create ample interiors and large spans with minimum support. The reduction of the number of structural elements falling in the ground results in a flexible, continuous open plan capable to change and adapt to different demands through the days and the years. At the same time, the vaulted concave space provides a continuous but full of nuances interior space, and a memorable experience.