American film director Ava DuVernay walks down the red carpet with the cast members of her new film "Origin" at the Venice Film Festival. "Origin" is based on a book by journalist Isabel Wilkerson, "Caste", which looks at the roots of racism in the United States as well as anti-Semitism in Germany and the caste system in India. The US director said she hoped her entry in Venice would set a precedent as the first by "an African-American woman" at the world's oldest film festival. IMAGES