http://www.canstruction.org/2005winners.html Canstruction®, trademarked by the Society of Design Administration (SDA) and held in conjunction with chapters of the American Institute of Architects (AIA) and allied professional organizations, is an annual charity competition where design firms test their mettle to see who can build the most astounding structure made entirely from full cans of food. At the close of the competition all of the food used in the structures is donated to local food banks to feed those most in need. Structures, ranging in size from 1,000 to 13,000 cans, are created by stacking a variety of can sizes and shapes using the product labels as the color pallet. Structurally self-supporting, the only other materials to be used are 1/4 leveling, cardboard, tape, rubber bands and wire. This past year competitions took place in 45 cities across North America. Local winners went on to compete via photography and were judged at the AIA/SDA national convention.