Warp wrote:
>   Don't listen to him. You can't get "infinite internal reflection" with
> povray.

I was more worried that the technique I proposed would make it 
impossible for any rays to ever get to the background, since they'd just 
be bounced by the sphere until the trace_limit was hit.  I don't think 
this would be a problem in David's case since all the rays will hit the 
moon anyway, but for a different scene it might make a difference.

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