• Getting ruff and ready with Frans Hals
• Sophie Calle takes on Picasso
• Can museums cope without dodgy donors?
• What Mark Rothko learned in Europe
Plus: Daniel Katz’s outstanding collection of Islamic pottery, the women Rubens kept on painting, a preview of Paris+ par Art Basel, 40 under 40 USA revealed, and reviews of Joshua Reynolds in Plymouth, the Surreal fantasies of Remedios Varos in Chicago and Palestinian embroidery in Cambridge.