Japanese company Sou Foujimoto Architects designed this unbelievable building on the request of their clients, a young couple with no children from Tokyo. The 85 sq. m (914 sq. ft.) house has 21 individual floor plates arranged at different levels above the ground. The plumbing facilities are located in the thick wall at the rear of the building. Whenever the owners want some privacy, they simply draw the curtains to hide from the outer world.