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Why is the triangle an important design motif inside San Carlo alle Quattro Fontane?
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Francesco Borromini
Piazza Navona, Rome, with the church of Sant'Agnese in Agone, designed by Francesco Borromini, and (foreground) the Fountain of the Moor, originally designed by Giacomo della Porta and revised by Gian Lorenzo Bernini.
Inside the San Carlo alle Quattro Fontane, the triangle serves as a significant unifying design motif because it is used as a symbolic representation of the Trinity.1