When Frida Kahlo (1907-1954) died in 1954, her husband Diego Rivera asked the poet Carlos Pellicer to turn her family home, the fabled Blue House, into a museum. Pellicer selected some paintings, drawings, photographs, books and ceramics, maintaining the space just as Kahlo and Rivera had arranged it to live and work in. The rest of the objects, clothing, documents, drawings and letters, as well as over 6,000 photographs collected by Kahlo over the course of her life, were put away in bathrooms that had been converted into storerooms. This incredible trove remained hidden for more than half a...