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The concrete foundation of Austin (Tex.) Public Library's Central Library, poured over a 24-hour period in May 2014, required 1,433 tons of reinforcing steel (top); the finished building shines above W. Cesar Chavez Street in downtown Austin (bottom). Photos: Austin Public Library (construction); Rachel Kay (exterior)

The concrete foundation of Austin (Tex.) Public Library’s Central Library, poured over a 24-hour period in May 2014, required 1,433 tons of reinforcing steel (top); the finished building shines above W. Cesar Chavez Street in downtown Austin (bottom). Photos: Austin Public Library (construction); Rachel Kay (exterior)