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.
KENYAN SOAPSTONE.
© Ray CharlesMare & Foal Experiment
© Michelle CampbellPastel Reflection
© Lem Metrobeautiful home interior
© Donna R. MoratelliRing Me Up
© Patricia Marroquin