Dziga Vertov’s radical experimental/documentary hybrid shows “a day in the life” of Moscow circa 1929 although the film had been shot over a period of several years in multiple cities including Moscow, Kiev and Odessa. The strobe-effect editing is mind-blowing even by today’s standards (the average shot length is less than three seconds) and the film is so densely packed with ideas that even after dozens of viewings, it still has secrets to reveal. But this is more than a “city symphony” film; it’s also one of the greatest movies ever made about the act of filmmaking, showcasing the talents of not only Vertov but his brother Mikhail Kaufman (the cinematographer who also frequently appears on screen as the title character), and his wife Yveta Svilova (the editor and the film’s true hero). The result is a film that playfully calls attention to the filmmaking process and its almost magical ability to record and transform reality.