We mark the 250th anniversary of the birth of visionary artist JMW Turner. We debate his life and legacy and how he transformed the way we view art and nature. Joining Patrick is Charlotte Topsfield, Prints & Drawings Curator, National Galleries of Scotland; Anne Hodge, Curator of Prints & Drawings, National Gallery of Ireland; and Niamh McGuinne, Paper Conservator, National Gallery of Ireland.