**Dr Karen Serres **is Senior Curator of Paintings, The Courtauld Gallery, London.Professor Richard Thomsonis Research Professor in the History of Art, Edinburgh College of Art, University of Edinburgh.Professor Paul Smith is Professorial Research Fellow in the History of Art, The University of Warw...

**Dr Karen Serres **is Senior Curator of Paintings, The Courtauld Gallery, London.Professor Richard Thomsonis Research Professor in the History of Art, Edinburgh College of Art, University of Edinburgh.Professor Paul Smith is Professorial Research Fellow in the History of Art, The University of Warwick