this lesson, we go deeper into one of the most essential structures in painting: the separation between light and shadow, and how shadows are actually built.

Understanding that there is a clear value division between light family and shadow family is only the beginning. Here, we break down what happens inside the shadow. Not all shadows are the same, and learning to recognize their internal structure will give you far more control over form, depth, and realism.

You’ll start to see how the core shadow defines the turning of the form, how form shadow describes the volume, how reflected light subtly reveals what’s hidden, and how cast shadows anchor your subject in space.

Some definitions to help you along the way 

Value Division 

The clear separation between the light family and the shadow family. All values in the light family are lighter than any value in the shadow family, with no overlap.

Core Shadow 

The darkest part of the form shadow, located where the form turns away from the light. It marks the transition between light and shadow on the object.

Form Shadow 

The area of shadow that describes the turning of the form. It is caused by the surface no longer receiving direct light.

Reflected Light 

Light that bounces from surrounding surfaces back into the shadow side of the form, slightly illuminating it without breaking the overall shadow structure.

Cast Shadow 

The shadow projected by an object onto another surface, caused by the blocking of light. It often has sharper edges closer to the object and softer edges as it moves away.