Scraphouse was an intensive one month design-build exercise to create a structure out of 100% recycled material for the celebration of World Environment Day, held in San Francisco in part to commemorate the founding of the United Nations. Public Architecture gathered together and coordinated local designers, including CMG, to frame a conceptual approach to the building and then design various components overnight. A broad team of volunteer artists and builders, including the designers, constructed the house over four days in front of San Francisco's City Hall.