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How did Francesco Borromini contribute to the design of the baldachin at St. Peter’s Basilica?

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Francesco Borromini played a vital role in the creation of the baldachin at St. Peter’s Basilica. While Gian Lorenzo Bernini held overall command of the project, the monumental bronze canopy was realized through the close collaboration of both architects.1

Borromini’s specific contributions were significant enough that Bernini paid him a substantial sum for his work between 1631 and 1633. Their most important shared creation for the structure is the set of huge S-shaped volutes that crown the four corkscrew columns.1