The final part of the new series that unwraps the mysteries of cinema. Tom Sutcliffe explores the emotional impact of slowing or stopping the action altogether. From the freeze frame at the decisive moment of Butch Cassidy and the Sundance Kid to that of Casino, cinema has proved beyond doubt that its power to move audiences can be stronger when the image itself ceases to move. Directors including Danny Boyle and Mike Leigh explain why the moving image .will always envy the still.