The original name of "Bird's Nest" is "B 1 1". Since the results of the global bidding for the national stadium design scheme were announced to the public, the "Bird's Nest" has become synonymous with the current implementation scheme, but it was not named by the designer, and it was called "B 1 1" in the evaluation process. Li Xinggang said: "We didn't give it a name, but used the word' Bird's Nest' in the submitted scheme description to describe the structural weaving characteristics of the scheme, so that people can understand it more vividly. Later, almost all media reports used this name, but it is impossible to verify from our text who picked out the' Bird's Nest' first. However, this nickname is also appropriate. " "High in the north and low in the south, the three-dimensional shape of continuous ups and downs. Then, the architect of the design consortium designed a braided steel structure for the outer cover, cleverly "hidden" the parallel track beam of the push-pull openable roof, and got the perfect answer that the structure is the appearance, which was later regarded as the "bird's nest". The unique grid structure of the "Bird's Nest" really looks like a bird's nest with branches entwined. With the lighting effect, it even floats lightly on the ground like a living body. Did the designer draw inspiration from the bird architect? Half of the building materials of Beijing Magpie Nest are steel. Has the designer ever studied the real bird's nest? Li Xinggang replied with a smile: "It is indeed an interesting phenomenon that birds build nests with steel, but we did not study the bird's nest during the design process." Has the "Bird's Nest" been modified or why is it designed to look like a "Bird's Nest"? Li Xinggang said that the "Bird's Nest" is an artistic achievement gradually obtained through rational analysis from the original state of the stadium. First of all, this is an arena. Its main function is to play and watch games. The stadium and the stands are the most important factors. The stadium is a north-south oval. Considering the balance of the audience's line of sight, the stand is designed as a bowl with continuous ups and downs. After that, the designer connected the roof canopy covering the stands with the facades of the functional areas such as the audience gathering hall behind the closed stands to form a complete stadium, which conforms to the shape of the bowl-shaped stands. Later, in order to "slim down" the Olympic Games, the project budget was reduced. The design of the National Stadium has undergone a major revision, canceling the openable roof and expanding the ceiling opening. Architects and engineers once again carefully woven the stadium structure, completely retaining the characteristics and essence of the original design. Li Xinggang said, "It is still a' bird's nest'." Many factors are often combined in the design of buildings, but I think energy saving and money saving should not be the priority of these buildings. China Grand Theatre is 30m underground (i.e. underground 10 floor! ! ! This is related to the fact that it is near Tiananmen Square, and the state requires the buildings around Tiananmen Square to be limited in height. No more than Beijing Hotel. This also determines the situation that it must develop downward if it wants to have a large space. But there are three small eggs in an egg, I don't know what it means! Maintenance of membrane of water cube (sandstorm in Beijing in spring is not covered! ) and operating cost (the gas in those membranes is preserved by a system, and this cost is not small) should be a criticism of it. The Bird's Nest can be said to be the embodiment of the development of architectural science and technology. It is conceivable that no one dares to design and build such a stadium without computers and related computing software. Of course, the cost of this system is also amazing! The demonstration of this ability is probably the practical significance of its modeling!