Light (both natural and otherwise) is an essential tool in photography - here's a gallery dedicated to light use in photos, including low-light photography, black and white available light photos, night and morning photos.
Cat on a Hot Wood Porch
© Patricia MarroquinLittle Cowboy
© Michelle Campbellshadow dancing
© Donna R. MoratelliSymphony in Stained Glass
© Patricia MarroquinCass & Mindy
© Michelle Campbell