The “Birds Nest” by Herzog & de Meuron is a great example of a skin like structure that became a reality with the help of computer aided programs as well as human ingenuity. The concept was based off the studies of Chinese ceramics and was first implemented in the design as ” two independent structures, standing 50 feet apart: a red concrete seating bowl and the outer steel frame around it” (wikipedia, Pasternack 2008, pp. 94) to help hide the stadiums retractable roof structure; which would be later removed from the design after reevaluating the stadiums main focus. This change dramatically lowered the cost of construction from $500 to $290 million and help the designers pursue other alternatives that increased the stadiums versatility. Grey water collectors were located close to the stadium and after filtering the water, it was redistributed throughout the stadium and the rest of the site. They also, added pipes below the playing surface to heat it in the winters and cool it in the summers. In all, the stadium consist of 91, 000 stadium seats with 11,000 temporary seats. The stadium consisted of 110,000 tons of steel, which was all made in China and was completed by the help of 17,000 workers.