Book excerpt: Surreal Friends brings together for the first time the work of three women Surrealist artists, brought together in exile in Mexico in the 1940s: British painter Leonora Carrington, Spanish painter Remedios Varo and Hungarian photographer Kati Horna. For all three women, Mexico offered freedom to explore their art in ways that had not been possible in Europe. Surreal Friends tells the fascinating story of their artistic friendship.