License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Karel Dujardin. Two mules bearing panniers and outfitted with blinders, plumes, and tassels; one mule in three-quarter view and behind it a mule in frontal view; beyond a man mounted on a horse directs mules with a rod, ca. 1641–78. The Metropolitan Museum of Art.