3 Tonality System: A minimum of 3 tones is required to create the illusion of 3D shapes on a flat surface. White, mid tone and black.
Objective: (1) Create a value scale that demonstrates five variations of tonality. Starting with white and gradually transitioning to black. (2) Draw a sphere, visualize a light source and render tonality so as to make the sphere appear to be 3-d.
Directions: (1) Using a ruler, create a row of 5 boxes. Render each box so as to create a value scale. Starting with pure white and gradually transitioning to pure black. (2) Draw a sphere and a imaginary light source. Visualize how the light strikes the sphere and apply a minimum of three tones so as to render the sphere in 3D. Apply a cast shadow to the sphere. If you have extra time consider the background. Apply shading to surrounding areas.