Piranesi as Designer
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Preparatory drawing for the high altar of S. Maria del Priorato, Rome, n.d.

The definitive form of the altar of S. Maria del Priorato emerged in this drawing, which includes superimposed sarcophagi supporting a sphere, on which rests the Apotheosis of St. Basil group. At this stage, there was no sign of the third sarcophagus, behind the first, which eventually supported the figurative group.