When Marilyn Monroe met Richard Avedon
Who really wants to buy video art?
An interview with Ragnar Kjartansson
The ballet that woke up post-war Britain
Plus: inside the new-look Buffalo AKG Art Museum, how to future-proof an art fair, and reviews of Hugo van der Goes, Gwen John, Berthe Morisot and a potted guide to the underground hippie press
What happens when an artist wants to be anonymous?
An Austrian museum is hosting a show by an unnamed artist – but perhaps this act of secrecy will help us see the work more clearly