Legendary film editor, sound designer, writer, translator, amateur astronomer and director Walter Murch needs no introduction. (Oh, what the hell, his credits include The Conversation, Apocalypse Now, The Talented Mr. Ripley, Tetroand more.) In addition to being a great filmmaker, he’s also a great teacher and talker about film. Here, at the 2013 Sheffield Doc Fest, where he accompanied the doc, Particle Fever, he gives an inspiring speech on film editing, technology, audience expectation, how film grammar is changing with digital technologies, and physics.