License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Johann Theodor de Bry. Men collecting dung dropping from the hindquarters of a mule, with a rider sitting backward on the mule and holding its tail aside, surrounded by onlookers spread around a stepped platform, from "Secular Emblems" (Emblemata Saecularia), 1592–1614. The Metropolitan Museum of Art.