This photo represents value. In this photo you can see the highlights where the sun is shining on her and the shadows where it doesn't. The darker areas show more depth than the highlighted ones. (photo by Sarah Loven ) Idea of using shadows
LIGHT: This is a photography of a hallway in a cathedral. There is very white, visual light shining through the windows which creates shadows on the floor. The design is very clear and simple because there are no colors or any disaccords.