Photography is famously about “writing with light”—or rendering light. In fact, light is integral to photography. You can’t photograph a physical object. You can only capture the light reflected or emitted by your subject.
How interesting then that the choice of rendering can lead a subject—such as Upper Horsetail Falls, shown in these two images—from darkness into light. Keep in mind that the choice is yours. But often the dark side is more mysterious, and therefore potentially more interesting!