Kikutake always referred his own biography, which crosses the history of Japan, to explain his personal elaboration of Metabolist’s principles. Son of a wealthy family of landlords, he was 17 when the war ended and his family was suddenly land-poor after post-war reforms. Faced to the remains of a country that was heavily hurt, the Metabolists started to develop a design attitude that addressed the need for buildings to adapt to the mutability of things. The sky-house applies this principle on the small scale, addressing the changeability inherent in a single family. The first addition to the main volume was the children room, a small space plugged under the floor, (a “move-net” as the architect likes to call it), which was removed when the children moved away. During more than 50 years several changes were made to the Sky-house, some improved the building following its own intrinsical logic, some irrimediably altered the house’s nature.