I have attached a partial screen shot taken part way through a render so I
can try and describe what I have so far been unable to do.

As you can see, the top of the sphere is very sharply delineated whereas the
effect I am after is the more cloud like effect that you can see at the
bottom of it.

This is the code for one of the spheres in the image.

==============  Code begins  ================================
union {
 light_source {
  <0, 1, 2>
  color Red
  looks_like {
   sphere {
    <0, 1, 2> 0.25
    no_shadow
    hollow
    pigment { Clear }
    finish { ambient 0.0 }
   }
  }
 }

 sphere {
  <0, 1, 2> 2
  pigment {
   color White
   filter 0.85
  }
  no_shadow
  hollow
  interior {
   ior 1.001
   media {
    scattering {
     2,
     0.3
    }
   }
  }
  finish {
   ambient 0.0
  }
 }
 translate <0, 0, 2>
}
==============  Code ends  ==================================

Can anyone suggest how to get the cloud like effect?

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