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File:AUS NSW Opera House DSC05118.jpg

English: The ribs of the opera house sails from inside the building. The sails were originally designed as parabolic, but after failures of the design in wind tunnel tests, they were changed to a spherical design. Photo taken and supplied by Brian Voon Yee Yap.
日本語: シドニー・オペラハウスの帆の形をした屋根のリブの写真。屋根は当初放物線の形になるはずだったが、構造設計上の困難や風洞試験の失敗などから球面を組み合わせたデザインへと変更された。写真はBrian Voon Yee Yap による。
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