became a small green hill. Perhaps in a conscious attempt to erase memories of the heavy monumen- tality of the 1936 Berlin stadium, a very expensive but delightfully elegant lightweight roof was thrown over one side of the stadium (Figure 1.10) and extended to several other facilities, creating an airy structure that still holds its age well 30 years later. The arena is embedded in an artificially created hol- low so that the roof, which consists of transparent acrylic panels on a steel net hung from a series of tapered masts, seems to float above the parkland, its gentle undulations mirroring those of the landscape below. It must be said that environmental problems have been experienced under the pool section of this