Situated in the rolling hills outside of São Paulo, this 10,763-square-foot family home designed by Brazilian architecture firm Studio MK27 takes its name from the structure’s low-lying horizontal form. The Planar House is built entirely of reinforced, poured in-situ concrete, except for the metallic pillars on opposite ends of the home. The green roof, which the architects call "the fifth facade of the building," is accessible via ladder.