JS1k: The JavaScript code golfing competition

function l(e,h,f,m){for(b=-2+e;b<1;b+=0.2)for(c=-1.5+h;c<1.5;c+=0.2){if(!b||!c)break;for(d=g=color=0;(i=d*d)+(j=g*g)<=4&&color<=512;color++){i=i-j+b;j=d*g*2+c;d=i;g=j}k[1]=color%8<<5;k[3]=(color>>3)%8<<5;k[5]=(color>>6)%8<<5;a.fillStyle=k.join("");a.fillRect((2+b)*200,(1.5+c)*200,1,1)}f<40?l(e+0.0050,h+0.0050,f+1,m):m()}function n(e,h,f){setTimeout(function(){l(e,0,0,function(){f<100&&n(e+0.0050,h,f+1)})},13)}var a=document.getElementById("c"),k=["rgb(",,",",,",",,")"],d,g=d=0,i,j,b,c;a.style.height=a.height=a.style.width=a.width=600;a=a.getContext("2d");n(-0.5,0,0);

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