> Er. Color me clueless, but how can the exterior sphere have any effect 
> on the scene with the interior sphere blocking it?

   Because the interior sphere has a "filter all, .99" on the image_map. 
The exterior one has a grayscale version of this image_map, with a 
exponential curve and high ambient, wich gets trough the interior 
sphere, colored by it.

   I promise to clean the code soon...

--
Jaime

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