Cast shadow is a term used to describe the dark area that forms when an object blocks light. The antonyms for cast shadow would be bright or illuminated, where there is no shadow present. Light and shadow are opposite aspects of the same phenomenon, and without one, the other cannot exist. Therefore, we cannot have a cast shadow without light, and we cannot have a bright area without a shadow being cast elsewhere. Both are necessary for our perceptual experience to make sense. In the context of art and photography, understanding these opposites is essential for creating dynamic compositions that play with light and shadow.