People in Black
Silhouettes are an artistic way to include a human element in your photography. By capturing dark underexposed figures, the subjects become more about shape and form as opposed to personality.
This technique can give a photo a universal quality as the person being silhouetted can take on any number of human qualities. It transports the viewer into the frame, allowing one to picture themselves as the silhouetted figure. To do this, you won't need any special equipment, but rather the proper lighting and knowledge of manual exposure.