add progressively lighter colors to the LOWER HALF of the
eye.
Why? Because as the rendering shows, an eye is like a ball with a bowl
shaped depression in it. When the light hits it, it highlights the lower
interior edge of where the iris is. (Iris = Colored part of the eye) So,
the iris color is darker on top, and lighter on the bottom, but the white
part of the eyeball is lighter on top, and dark underneath.
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