We started a shading lesson today. Shading involves the Element of VALUE. We also use the Element of SHAPE while working out where the lights and darks in the picture are placed.
I placed a playground ball on the center table in class and illuminated it with a lamp. We talked about using the Element of SHAPE to lightly sketch in the shapes formed by the shadow on the table, the shadows on the ball, and even the dull light bouncing up on the back side of the ball from the table.
Students had an opportunity to walk around the room and see how the shadow shapes change on the ball depending on the angle you are viewing it.