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.
Symphony in Stained Glass
© Patricia MarroquinCass & Mindy
© Michelle CampbellSand ridges
© Tony SweetFarmland skyline
© Tom W. HauberKENYAN SOAPSTONE.
© Ray CharlesMare & Foal Experiment
© Michelle Campbell