Today we devote our entire show to film. On our regular Friday feature, Please Explain, we look into the changing technology of how movies are made. We'll talk to John Tintori, an editor and professor at NYU, and Giovanni Cozzi, a digital technology and projection systems expert from Emerging Pictures film company. Next, Peter Cowie analyzes the visual imagery of John Ford’s Westerns, and explains how these films helped shape our perceptions of the American West. Then, film critic David Thomson (author of The New Biographical Dictionary of Film) offers his version of the evolution of the Hollywood aesthetic: The Whole Equation: A History of Hollywood. Finally, as part of our celebration of Leonard Lopate's 20th Anniversary on-air at WNYC, we're re-airing an archival interview with British filmmaker Michael Powell from 1987.