> camera{location y-z*6}background{rgb 1}union{plane{y,0}plane{x,1
> }finish{reflection .9}}cylinder{0,y,.1}cylinder{y,x,.1}//MartinM

background{rgb 1}cylinder{z*6x+z*6-y.1}cylinder{z*6z*6-y.1
}union{plane{y,-1}plane{x,1}finish{reflection.9}}//MartinM


-- 
merge{#local i=-11;#while(i<11)#local
i=i+.1;sphere{<i*(i*i*(.05-i*i*(4e-7*i*i+3e-4))-3)10*sin(i)30>.5}#end
pigment{rgbt 1}interior{media{emission x}}hollow}//  Mark Weyer

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