not an easy book
Borromini's chapel in the Propaganda Fide is a directional hall in plan, but its alternating bays counteract this effect: a large bay dominates the small end; a small bay bisects the center of the long wall. The rounded corners, as well, begin to imply a continuity of enclosure and a central-type plan. (These characteristics occur in the courtyard of San Carlo aIle Quattro Fontane too.) And the diagonal gridlike ribs in the ceiling indicate a multidirectional structure as much like a dome as a vault.
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