> OK I fixed it.  The dark areas in the reflection are actually the sky, not 
> the floor!  So I put a white sky in there (instead of black) and it looks 
> exactly right now. (the dark area in the reflection *is* the floor in the 
> distance)

OK maybe not totally fixed.  I got the lighter reflection bit ok, but now 
the dark areas around the caustics inside the rings are not as black as the 
original.  I give up!

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