A detail from the glorious "Self-portrait in a Tuxedo" (1927) on view at the Harvard Museums weird ass "greatest hits" installation at the Sackler. Everyone is usually kvelling over his use of black but the joy is the chromatic shadows in the face. You can see this painting and then go look at the Poussin's upstairs and wonder how people could ever think that making a shadow was a matter of adding black.