There is a drama to a light form emerging from the dark that has been known and used by artists for centuries. Leonardo Da Vinci said: "A painter should begin every canvas with a wash of black, because all things in nature are dark except where exposed by the light."
Sometimes, however, it is interesting to see what happens when a subject emerges from the light, so that the parts we see are those that are in the shade, rather than those that are lit. When that subject is itself quite light in colour, I think it makes for shapes that almost reach abstraction, and where we must work to identify the parts, even as the whole makes sense. If nothing else, it's a challenge a a lot of fun!