License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Suzuki Harunobu. A Teenage Boy and Girl with a Viewer for an Optique Picture (Nozoki-karakuri); Kōbō Daishi’s Poem on the Jewel River of Kōya (Kōya no Tamagawa: Kōbō Daishi), ca. 1788. The Metropolitan Museum of Art.