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.
100 Years Happy
© Debi GomezFamily again
© Michelle CampbellKings of the Mountain!
© Juliane Morris-LuskChristmas 2001
© Jacqueline W. MillsBecky & Ryan Too
© Michelle CampbellNew Kids On The Block
© Bonnie Shedd