The M/W class began their studies of the Ideal Solids. See previous post for more info. Note in Tara's drawing above the way line complements the tonalities. It's important to swell the line in areas so as not to "cut-out" the form too much. An even line around a form is "flattening" rather than creating volume. Observe the cone, cylinder and open cylinder and note how the line on the light side of the form broadens at the base of the forms and almost "breaks" or disappears as it approaches the top. These are lines suggesting volume.