Trace the shadow of your sculpture - foil figure or another object with a clearly identifiable shape. Ask, "If I hold the light here, will the shadow move?" Explore how the shadow elongates and shortens as the light is moved.
Kids Shadow Art :: Tracing the Light - Such a simple and beautiful art activity for children! I think this could work for all ages especially if you expand on the lesson and incorporate themes of neg/pos space, pattern, color, etc.