License, verbatimPD
The National Gallery of Art: open access image with no usage restrictions under the NGA's open access policy (openaccess=1 in the Gallery's published_images dataset).
Odilon Redon. L'Aile impuissante n'eleva point la bete en ces noirs espaces (The impotent wing did not lift the animal into that black space, 1883. National Gallery of Art, Washington.