The Musée d’Orsay holds 225 of the pieces and has engaged a team of researchers to examine their history and provenance so they can eventually be returned. Until such time as they are, they will be displayed on rotation, a dozen or so at a time, in an exhibition entitled Who Owns These Works? The rest remain in the museum’s permanent collection where they have been tagged with purple labels to distinguish them. “By dedicating a room to these artworks, the museum hopes to both highlight the specific issues related to them and convey to the public the memory of...