A building without doors,the Brazilian Pavilion at the 1970 Universal Exposition,in Osaka,Japan,resulted from a national public competition held in 1969,during military dictatorship in Brazil. Among the collaborators that formed the winning team,artist and professor Flavio Motta and engineer Siguer Mitsutani were particularly important to the development of the proposal. After the competition,Paulo Mendes da Rocha and Japanese engineer Kazuhiko Sato coordinated the development of the project,at the office of the construction company,Fujita,in Osaka. The pavilion was built in the western portion of Expo Park,on a rectangular lot,70×50 m,next to the Soviet Union pavilion and between the Czechoslovakia and Hawaii pavilions. After the world's fair,the building was demolished. The building that would represent Brazil at the 1970 fair was a rectangular concrete roof placed over 4 points,one on a cross-arch pillar,representing the cities,and 3 of them on small dunes,representing nature - an affirmation of the necessity of using intelligence (and hence,techniques) to make Brazil's and Latin America's huge territories suitable for human interaction. Extending across the lot,the roof was 32.4×49.6 m and built with prestressed concrete beams in both directions,forming a geometric network that illuminated the asphalt floor with skylights. The design of the beams reflected the structural efforts applied to them.
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