Here is the same scene, but without the light source, and the sphere has a
varying ambient finish instead.  Looks nearly the same.  However, I believe it
may be easier to use the double_illuminate/diffuse/light_source combination for
certain types of scenes.  For example uneven lighting on a translucent surface,
which itself has variations in transmittance.

-The Mildly Infamous Blue Herring

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