Another 5 minute attempt. I think that with the 5 minute version you can 
actually get half a chance to make something identifiable (compared to the 
2 minute challenge where I could hardly manage to get my global_settings 
done in the time limit).

Here's the source:

global_settings{radiosity{count 120 error_bound 0.5 pretrace_start 0.08 
pretrace_end 0.02}photons{spacing 0.005}}
box{3*y-3,3*y+3 clipped_by{plane{y,5}}hollow on pigment{rgb 
1}finish{ambient 0}}
camera{location <2, 2, -2>look_at z-x+y}
light_source{<60, 300, -120>, rgb <1,.9,.7> fade_distance 350 fade_power 2}
sphere {0, 1000 pigment{rgb <0.3, 0.6, 1>}finish{ambient 1 diffuse 0}}
sphere{y, 1
pigment{rgb 1}finish{ambient 0 diffuse 0 reflection .99 specular 1 
roughness 0.001}
translate z-x photons{reflection on target}}
box{-1,1 pigment{rgb 1}finish{ambient 0} translate z-x}

-- 
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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