light_source{3*z,rgb 1}sphere{0,9pigment{rgb z/4}hollow}media{scattering{4,.08}}
#local N=0;#local X=0;#local Y=0;#local R=seed(2);#local S=sqrt(2);
union{#while(N<1000*pow(10,clock*3))
#if(rand(R)<.5)#local A=Y/S+1.5;#local B=1.5-X/S;#else#local A=.5-Y/S;#local B=X/S+.5;#end
#if(rand(R)<.5)#local X=A-2;#local Y=B;#else#local D=pow(A-2,2)+B*B;#local X=(A-2)/D;#local Y=B/D;#end sphere{<X+1,Y-1,5>,.6*exp(-5*clock)+.01}
#local N=N+1;#end pigment{rgb<.4,.3,.1>}finish{specular.8}}