The new exhibition of paintings by Raphael at the UK’s National Gallery is expected to be an illuminating look at a body of work that has rarely, if ever, been seen in one place. Tickets are already at a premium, and the National will undoubtedly clean up on the show, financially speaking. And that’s good news for the exhibition’s curator, who has been working on the show for a mind-boggling six years, because she has never been so exhausted in her life.