License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Chōbunsai Eishi. Matching Shells (Kai-awase), “Kisen Hōshi,” from the series Modern Parodies of the Six Poetic Immortals (Yatsushi rokkasen: Kisen Hōshi), ca. 1796–98. The Metropolitan Museum of Art.