Its all about the light and shadow. Even color photographs depend on light and shadow. Shadow detail is a crucial aspect of many photos, the difference between a featureless pool of black and some range of tones leading ultimately to black.
My interest in photography goes back quite a few years. When I was eight years old living in Queens NYC, my father and I used to take pictures. When we moved to the suburbs, my father built a darkroom in our new house and I spent many teen hours in the dark making black and white prints.