My favorite book about film editing is “In the Blink of an Eye,” by Walter Murch, in which he theorizes about why editing works. I stumbled on this extraordinary 2-part video (40 min each), recorded during a talk he gave in London in 2003. It’s just packed with the kind of thoughtful brilliance that only Walter Murch can deliver. Everyone one of us who aspires to editing film should be so lucky as to have this man’s voice in our heads, quietly reminding us, “your duty is to expect miracles.”