A torch flashed at a square panel standing vertically
on the floor, produces the sound of human onomatopoeias which vary depending
on the area onto which the light is projected. Nine different grimaces
are depicted on this photographic panel. Each facial expression becomes
visible by means of a light box mechanism, whenever the flashlight points
at it. A corresponding onomatopoeia is then produced by a sound sampler.
The effect is a large human chorus conducted by the action of a flashlight.