Last night students made studies of the Ideal Solids. Although these forms are found in most objects, they too have "root" shapes. First start the cone as a triangle and then add the ellipse to the base. Cylinders start as rectangles or squares with ellipses applied at top and bottom. Once the structure is complete the categories of light may be addressed. Remember when applying tonalities, you will get the greatest sense of volume and three-dimensionality with a single light source and strong contrasting values. Lastly remember that rectilinear forms (cubes, pyramids, etc) will have abrupt changes into value moving from one plane to another whereas curvilinear forms (spheres, cylinders, etc.) should exhibit smooth, even gradations from light to dark.