Wasn't it Junkboy316 who wrote:
>Hi.
>
>Im a real beginner and am trying to recreate this image to get into the
>swing of things. I think im getting there but have no idea how to create
>the transparent sphere. All the ones ive attempted have created an upside
>down version of the checkered floor. Any help on where to start would be
>much appreciated.

I think it's a bubble, something like this

difference {
  sphere { 0,2}
  sphere { 0,1.9}
  pigment {rgbt <1,1,1,0.9>}
  finish {phong 0.3 phong_size 100}  
  interior {ior 1.1}
}

In fact, I suspect that it may well be half a bubble. I can't think of
any other way for POV to omit the second highlight. Perhaps the software
he was using back then couldn't manage the second highlight.

difference {
  sphere { 0,2}
  sphere { 0,1.9}
  plane {-z,0}
  pigment {rgbt <1,1,1,0.9>}
  finish {phong 0.3 phong_size 100}  
  interior {ior 1.1}
}

-- 
Mike Williams
Gentleman of Leisure

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