"These" were Piero della Francesca's frescoes in the church of San Francesco in Arezzo, Italy, a place of pilgrimage, then as now, for lovers of the severe Renaissance master from Umbria.
"Piero dellaFrancesca in America, " the splendid small exhibition organized for the Frick by the guest curator and former Andrew W. Mellon Fellow Nathaniel Silver, bears witness to the effects of that trip.