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Explain how the form is a three-dimensional shape and show how high-light,
shade, shadow,reflected light, and backshading create the form. Now, have
them shade some forms using the 5 principles of shading, using gradations, and
they can finish in one period. Have some other styrofoam forms to see, such
as cones, cubes(board), pyramids (board), cylinders, and prisms.
Ken Schwab
San Jose, CA