> There's a key difference between media and textures. Textures have finishes.

The finish statement models the interface between two materials, or more 
specifically where there is a step change in the index or refraction 
(IOR). As POV can only assign a constant IOR to a media object it is not 
possible to calculate reflection effects (reflection, refraction, 
specular etc) within media.

Ideally the IOR should vary within media (proportional to density 
perhaps) which would automatically create reflections at the correct 
places internally, but that's not exactly trivial to implement.

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