Believe it or not, the Broad Pavilion, one of 17 corporate pavilions at the 2010 Shanghai World Expo, was completed in under 24 hours! The six-story energy-efficient structure was designed to use just 20 percent of the materials used by other pavilions of a comparable size. It also consumes just one-sixth of the energy of similar-sized pavilions due to a series of passive solar design techniques: 15cm thick insulation, triple-layered non-metallic framed windows, exterior shading and fresh air heat recovery. “We’ve been preparing for two months, but producing all the prefabricated parts in our factory took us less than a week,” said Fu Lixin, who oversaw the pavilion. Check out a time lapse video of the construction here and a video describing the pavilion here.