I know that shadows have a similar shape to the objects forming them.
I know that when light is blocked by objects, shadows are formed.
I can show in drawings that the shape of the shadow is like the shape of the object but is different at different times of day.
I can say what happens to the shadow of a stick during the day eg it gets shorter and then longer again
I can predict what the shadow will be like at noon compared to morning or evening
I can make accurate measurements of the length of the shadows.