Inspired by early 20th-century avant-garde graphical sound experiments, ‘O/S’ explores digital approaches to the analogue technique of optical audio. In contrast to drawing on a celluloid film strip’s optical soundtrack, in ‘O/S’, the entire image is a soundtrack: Everything you see generates sound. What you hear is what you see. All tones in ‘O/S’ have been composed visually by designing specific visual shapes and movements. The challenge was to create a film that balances visual and sonic expression to create a synaesthetic experience for the viewer: A work that is created visually but also sounds interesting.