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. Quand s'eveillait la Vie au Fon de la matiere obscure (When life was awakening in the depths of obscure matter), 1883. National Gallery of Art, Washington.