Mara Motley, M.D., and Valerie Gerrard Browne donated “Hot Rhythm” by Archibald Motley to the Nasher Museum of Art.   WHEN ‘ARCHIBALD MOTLEY: JAZZ AGE MODERNIST’ opened at the Nasher Museum of Art at Duke University three years ago, one of the most compelling aspects of the exhibition was the presentation of a series of...