'Pyramid Roof House 2011' is in a suburb of Yokohama in Japan with a big field in front and a mountain behind.The roof looks like a symbol as traditional houses in Japan have.The house has two axial lines: a line connected with the big windows in the east and the west and a line connected from a southern entrance to a northern kitchen door.Two axis lines connect inside and outside.The ceiling side is illuminated with the top-light in the east which makes brighter in the house.