When teaching a workshop, one of the things we focus on is light: seeing the light, controlling the light (on site), and working and playing in the digital darkroom with light.
One of my favorite photo adages is: Light Illuminates, Shadows Define.
That adage is illustrated by this set of pictures, which I took during the Mt. Rainier Aperture Nature Photography Workshop. The image on the left, taken before sunrise, shows the subject illuminated by light… but there is little definition in the scene. The picture on the right, taken shortly after sunrise in the same general location, has much more definition – due to the shadows in the scene.