Loo Y.
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Santo Spirito does not try to dazzle you with a façade. It saves its argument for the interior, where Brunelleschi’s design begins in 1444 and keeps speaking even after his death in 1446, carried on by his followers. The plan is a Latin cross, but it behaves like a grid: repeatable units, same-sized chapel niches running in a continuous ring, architecture as a calm system rather than a single flourish. Corinthian capitals top the columns like punctuation marks, and the perspective lines keep you honest - walk slowly and the space stays perfectly legible. It is still Augustinian, still in use, and the visitor route threads devotion through objects: side chapels dense with patron commissions, Perugino’s Pentecost window, a 1601 baldachin, and Michelangelo’s wooden crucifix waiting in the sacristy.