The Glory of the Holy SpiritGiovanni Battista Gaulli

This radiant fresco (c. 1679) fills the dome with concentric rings of clouds, gilded ribs, and crowded figures. At the center, the Holy Spirit appears as a white dove in a glowing medallion, encircled by saints and angels swept upward in swirling light. The painted architecture merges with the real cornice, a Baroque illusion that makes the vault seem to open into a realm of revelation.