An educated guess: the wave normal is actually refracting as though
there were height levels to the surface, showing the planet through the
crest and reflecting again into the trough, as well as the primary
reflection already being there.
(i'm not a guru, only look like one if i don't cut my graying hair often
enough)

David Cook wrote:
> 
> As for the multiple reflections, I hate to have to admit it, but I don't
> know. I did think it was kind of cool too, which is probably the only
> redeeming reason for posting it. Here's all I did, maybe one of the gurus
> can explain it to us.
> plane
> {
>   y, 0
>   pigment { rgbf 1 }
>   normal { waves }
>   finish
>   {
>     reflection 0.75
>     specular 1
>   }
>   interior { ior 1.333 }
> }

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