This physical experience is an illustration of the relation between light, the observer and the painting and its importance in the work of Soulages. The position of the observer is tracked in real time and influences the lighting on the painting.
 
Two light systems surrounds the Outrenoir painting. The first one, a suspended half-circle of spots, offers a variation between front and lateral lighting. The second one, consisting of grazing lights, moves along the side of the painting, revealing its relief.