The Sotheby’s Impressionist & Modern Art Day Sale on May 15th promises a compelling selection of oils, sculptures and works on paper with outstanding provenance. A charming pastel of Degas’ much adored dancers which has remained in the same collection since 1971 is complimented by a glowing, multicolored landscape by Francis Picabia, an enamoring 1920s work on paper by Marc Chagall, a seminal surrealist bronze by Max Ernst and an evocatively colorful oil by Paul Signac.