How did Piero della Francesca create monumental figures in the S. Agostino altarpiece?

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In the S. Agostino altarpiece, Piero della Francesca created monumental human figures through the sculptural use of line and light.1

This approach was a hallmark of his mature style, which emphasized clarity, structural simplicity, and a serene, disciplined exploration of perspective. By employing these techniques, he achieved a sense of monumental dignity in his figures that reflected his deep interest in geometry and mathematical proportion.12