Rediscovering optical sound - a 1920s invention originating in film and employed in early synthesizers, Mariska de Groot provides the technology with a life of its own creating instruments that openly reveal their function. 'Quadtone - lumisonic rotera' is a mesmerising light-is-sound projection performance in space. Graphical patterned wheels code a beam of light, which portable light-sensitive speakers convert into audible frequencies. All leftover light is visual sound.
