How Does a Shadow Know Where the Light Is?

Shadows follow the light because they can’t see it, but they know where it is. When a light moves, like the sun or a lamp, the shadow knows to move too! Imagine you're blocking sunlight with your hand, your shadow appears on the ground. If you walk toward the sun, your shadow gets shorter and follows you like a little friend. Shadows can’t see the light, but they react to it, just like how your shadow moves when you move.