Over the past 30 years Brazilian photographer Sebastião Salgado's work has won every major award for excellence. His photographs have had an actual impact on the world and how it is seen, bringing conditions of famine and poverty to public attention in a profound and arresting way. In The Spectre of Hope, Salgado joins John Berger, one of the world's leading art and photography critics, to pore over Salgado's collection "Migrations." Six years and 43 countries in the making, "Migrations" contains photographs of people pushed from their homes and traditions to cities and their margins—slums and streets and refugee camps. Sitting at the kitchen table of Berger's home in Quincy, a village in the Swiss Alps, their intimate conversation, intercut with photographs from "Migrations," combines a discussion of Salgado's work with a critique of globalization, and a wide-ranging investigation of the power of the image.