Making Shadows

Warm, calm indoor scene: a small desk lamp shining toward a pale wall. A child’s hand is held in midair between lamp and wall, not touching either. A clear, slightly oversized hand-shaped silhouette appears on the wall. Soft golden light rays suggested as straight lines from the lamp that stop at the hand; the wall patch is simply darker, not scary. No faces in distress, no horror mood, curious and cozy.
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Big question

Why do shadows have shapes?

A sharp shadow forms when an opaque object blocks light from a small, bright source. You’ll figure out why the dark patch on the wall looks like the object, and when it gets fuzzy.

By the end

You can explain that a shadow is the space where light is blocked, and that its shape is the object’s outline as seen from the light source.