One theory on how this works is that the viewer’s cones react to the energy of the painting producing a blinking light. What and how this happens is still unclear. It appears that the vibration and the trust of the viewer, when in a relaxed state; produce the blinking light. As a unit; the painter, the canvas, the paint, and the viewer create an unusual metaphysical experience. The blinking is a joint effort. Usually the people who see the light blinking are kids and people who meditate. I can only assume it is because their vibration is strong, clean, and clear.