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Also known as shade

thumb|The shadow of a musician cast onto a brick wall thumb|Park fence shadow is distorted by an uneven snow surface. thumb|Shadows from cumulus clouds thick enough to block sunlight A shadow is a dark area on a surface where light from a light source is blocked by an object. In contrast, shade occupies the three-dimensional volume behind an object with light in front of it. The cross-section of a shadow is a two-dimensional silhouette, or a reverse projection of the object blocking the light.