Shadow Study

This device shows the different position of light and affects the shadow of objects.
First of all, the light source had located on Z (of 1,2,3).The shadow of objects had been shown three different layers and different materials of objects had been shown on the notation board.
Then, changing the light source of position from X (of 1,2,3,4,5) to Y (of 1,2,3,4,5) is clearly to see the shadow of objects had been affected by different location.