In 1931, after studying painting, frequenting the Surrealists and making his first journey to Africa, he decided to devote himself to photography. From Mexico City to New York, from Gandhi’s India to Fidel Castro’s Cuba, from communist China to the Soviet Union of the 1950s, he never stopped travelling the world with his faithful Leica pressed to his eye. The curator and historian invites us to follow the shots of this tireless traveller who, shunning sensationalism and defending the integrity of his pictures, gave prestige to reportage and made "the image à la sauvette" an ethic and an aesthetic.