... erasers, and shadows with pencils. In other words, you take away values rather than adding them! Form, as applied to drawing, is the illusion of the three-dimensional structure of a shape, such ... crescent shape or backwards “C” (refer to illustration 0 1-0 6). 8) Draw the cast shadow underneath the sphere. The cast shadow is on the surface, under and to the right of the sphere. The shading ... circular shape. Shape refers to the outward outline of a form. Basic shapes include circles, squares and triangles. The light source is coming from the upper left, which affects the placement and...