Diagram of a Sphere: Value Study

I can draw a sphere.
I can create the illusion of a 3 dimensional form.
I understand the difference in and outline and a fully shaded object.

Vocabulary: sphere, form, value, highlight, core shadow, shading, cast shadow, gradient

Performance task: Draw a sphere in your sketchbook.  Try to contour your drawing to the shape of a sphere (not side to side, rounded marks).  Try to blend your values as you shade from the core shadow to the highlight.

image source: http://pd.scisdragons.net/msart1/2011/09/22/sketchbook-assignment-5-spheres-composition/diagram of a sphere

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