The earliest films consisted of single, unedited shots. Filmmakers began experimenting with linking multiple shots together to tell stories and using techniques like close-ups, fades and reverse cranking for effects. Editing evolved from physically cutting and gluing film, to digital editing using computers. Different approaches to editing emerged like D.W. Griffith's dramatic cutting style and Soviet filmmakers' theories of montage to convey abstract ideas and meaning through juxtaposition. The advent of sound changed editing by requiring synchronous audio and video, restricting actor movement and dialogue-driven continuity. However, experimentation with dubbing and asynchronous image/sound continued.