**Dr Barnaby Wright **is Deputy Head of the Courtauld Gallery, London, and the Daniel Katz Curator of 20th-century art.Dr Karen Serresis Senior Curator of Paintings at the Courtauld Gallery, London.Dr Chloe Nahum is the Bridget Riley Art Foundation Curatorial Fellow at the Courtauld Gallery, London.

**Dr Barnaby Wright **is Deputy Head of the Courtauld Gallery, London, and the Daniel Katz Curator of 20th-century art.Dr Karen Serresis Senior Curator of Paintings at the Courtauld Gallery, London.Dr Chloe Nahum is the Bridget Riley Art Foundation Curatorial Fellow at the Courtauld Gallery, London.