In Chinese mythology, the sun is represented by a circle and the moon by a square, reflected by the shape of the bird's nest and the Water Cube aquatic centre opposite, reinforced when the venues are lit at night, red for the Bird's Nest and blue for the Water Cube. The forms also echo the Chinese symbols for male and female, and are built either side of the north-south axis road which runs in a perfect straight line for three miles through Beijing, centered on the Forbidden City.
The eastern and western stands of Beijing National Stadium are higher than northern and southern stands, in order to improve sightlines. A 24-hour per day rainwater collector is located near the stadium; after water is purified, it is used throughout and around the stadium. Pipes placed under the playing surface gather heat in the winter to warm the stadium and coldness in the summer to cool the stadium.
Beijing National Stadium hosted the spectacular Opening and Closing Ceremonies, athletic events, and football final of the 2008 Summer Olympics, from 8 August to 24 August 2008. The stadium also hosted the Opening and Closing ceremonies and athletic events of the 2008 Summer Paralympics from 6 September to 17 September 2008. Though designed for track & field events of the Olympics, the stadium will continue to host sporting events, such as football, afterwards. A shopping mall and a hotel, with rooms overlooking the field, are planned to help increase use after the Olympics. It will become the most important public space in Beijing."