TO GO WITH AFT STORY BY ARNAUD BOUVIER - People sit in front of the "Heliodrome", a bioclimatic solar house on August 17, 2011 in Cosswiller, eastern France. The house is designed as a giant three-dimensional sundial, set on a fixed angle in relationship to the sun's movements to provide shade or sunlight depending on the season. AFP PHOTO / FREDERICK FLORIN (Photo credit should read FREDERICK FLORIN/AFP/Getty Images)
