When you’re making a photograph, a painting or a film, and you use some kind of light or some kind of color, you’re sending a message. If you don’t know it, you’re doing it according to how you feel is right. But if you’re aware of it, if you studied the symbology, physiology, dramaturgy of light or color, you can use them like a musician using do, re, mi, fa, so, la, ti, do. You’re using red, orange, yellow, blue, violet. That’s the point.