What is Form?

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Across
  1. 4. shapes with mathematical equations
  2. 5. light shining directly on an object
  3. 6. French for "fools the eye"
  4. 8. area shaded on the object, usually the underside
  5. 9. difference in value of light and shaded areas
  6. 10. the use of light and shadow
Down
  1. 1. shadow of the object, darkest colors of value
  2. 2. three dimensional shapes
  3. 3. viewing something from different angles
  4. 7. shapes found in nature