The document discusses the topic of contrasts in photography. It defines contrasts as the relative difference between light and dark areas in an image. Contrasts can be explored through various means and ideas like opposites. The theme of contrasts is important not just in photography but in society as well, as without contrasts life would be boring and unoriginal. The document then examines how contrasts have been used historically in genres like black and white, fashion, and landscape photography. It provides examples of photographers like Mary Ellen Mark who use contrasts to explore social themes. The document also discusses how technology has allowed new techniques like HDR photography and advances in exploring contrasts going forward.