Shedding light on treasured vaults

In 1881, a Spanish builder named Rafael Guastavino immigrated to the United States with no job, no family awaiting him and no grasp of English. He did possess one valuable piece of knowledge, however: Guastavino had learned a technique, unknown in the United States, for building large structures, such as decorative arched ceilings, that were both lightweight and fantastically sturdy.

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