The phrase 'The Art of Light and Shadow' often refers to the technique of chiaroscuro, which is a method of using strong contrasts between light and dark to give the illusion of volume in modeling three-dimensional objects and giving the illusion of light. It is a fundamental principle in the visual arts, particularly in painting and sculpture, and is used to create dramatic and expressive effects. Chiaroscuro can also be a term used to describe the art form itself, focusing on the manipulation of light and dark to convey emotion or create an atmosphere.