Cornell University's submission to the U

Cornell University's submission to the US Department of Energy Solar Decathlon sits on display at the National Mall in Washington, DC, October 7, 2009. Each of the house's silosókitchen, bedroom, and living rooms 16 ft (4.9 m) in diameter, with about 130 ft (12.1 m) of floor space. The modules are joined on the southern side, leaving the northern side open. The exterior is covered with COR-TEN, a corrugated, steel cladding that loses its original sheen as the outer layer oxidizes to a weather-proof ruddy coating. AFP PHOTO/Maria Belen PEREZ GABILONDO (Photo credit should read Maria Belen Perez Gabilondo/AFP via Getty Images)