Well here's my attempt. It took me several attempts (each time starting 
from scratch) to get anything that would even run. I'll now try Rafal's 5 
minute version and see if I can produce anything a bit better. On another 
note, I ended up taking a few seconds longer because I realized my camera 
was broken after I started the final (and slow) render. Hehe, the render 
time was three times the creation time! ;-)

Here's the source:

global_settings{radiosity{count 300 error_bound 0.1 pretrace_start 0.08 
pretrace_end 0.02}}
sphere {0, 1000 pigment{rgb <0.3, 0.6, 1>}finish{ambient 1 diffuse 0}}
box{3*y-3, 3*y+3 clipped_by {plane{y,5}}hollow pigment{rgb 1}finish{ambient 
0}}
sphere{<2, 1, 1.5>, 1 pigment{rgb 1}finish{ambient 0}}
camera{location <-1,1,-2>look_at 0}

-- 
light_source#macro G(E)sphere{z+E*y*5e-3.04rotate-z*E*6pigment{rgbt#end{
20*y-10#local n=162;1}#while(n)#local n=n-.3;G(n)x}}G(-n).7}}#end//GregE

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