A couple of "fishnet" roofs, which are lifted by 50 suspension pillars, form a casual roof. The roof of "fishnet tent" is like a fisherman's fishnet that has just come up with water. The fish net account is translucent, all made of plexiglass. It is said that the roof cost more than 100 million marks and was the most expensive in the world at that time. It has become a miracle in the history of architecture in the world because of its peculiar conception and unique shape.