Designed as an extension to an 18th-century structure near Versailles, this development sought to provide every member of the family with a private realm. Building regulations permitted only a single volume with a pitched roof. The design foresaw an amorphous plinth storey with curved stone walls heaped up with earth and used as a general living area. From room-height windows, paths lead out into the garden. Projecting above the accessible planted roof are five tower-like volumes. Since they have an area of less than 25 m2, permission was granted to create flat roofs. Extensive glazing here enhances the natural lighting on the ground floor. The views from the top of the house extend as far as La Défense.