Benozzo Gozzoli
The Parable of the Trinity

Fresco, 86.6 x 90.6 in. (220x230 cm.)
Church of Saint Augustine, San Gimignano, Italy

In the lower left the boy tells the saint he is no more likely to understand the Trinity than the boy is to put the ocean into the little hole at his foot. Above center, Augustine teaches a crowd of lay people about the Trinity. Below right, he leads the canons of his monastery in the study of scripture. Anachronistically, he and they wear the black habit of medieval Augustinians.

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Source: this page at Wikimedia Commons.