This document discusses chiaroscuro, a technique used in Renaissance art, photography, and film to add depth and realism through the use of light and shadows. During the Renaissance, artists began using shading to make drawings and paintings appear more three-dimensional. Through chiaroscuro effects, we perceive three-dimensional volume. The document also mentions how Rembrandt used chiaroscuro in his self-portraits and how many classic film noirs employed low-key lighting schemes with stark contrasts between light and dark areas.