Form shadow

Plural: form shadows

Form shadow definition

A form shadow is the area on an object that turns away from the light source and therefore receives less direct light.
In drawing and painting, a form shadow describes the shadow caused by the object’s own shape, not by the shadow it casts onto another surface.
It usually appears as a gradual transition across the form, helping describe volume, roundness, and structure.

Examples

On a sphere lit from the left, the right side shows the form shadow.

In a portrait, the side of the nose turning away from the light is often in form shadow.

An artist uses the form shadow to make the cheek look solid and three dimensional.

Context

Form shadow is a key term in representational drawing and painting. It belongs to the shadow family and helps explain how light reveals the structure of a form. Unlike a cast shadow, which falls onto another surface, a form shadow stays on the object itself. Understanding form shadow is essential for painting volume, especially in studies of spheres, portraits, still life, and figure painting.

Core Principles

Derivation

The term form shadow combines form, meaning the three dimensional shape of an object, and shadow, meaning the darker area created when light is reduced or blocked. The phrase is used in art education to distinguish the shadow created by the turning of a form from the cast shadow projected outward.

The Lexicon by Alex Righetto