size(500,500);
background(0,0,0);
smooth();
fill(0,250,250);
ellipse(250,250,250,250);
fill(0,220,220);
ellipse(250,250,220,220);
fill(0,200,200);
ellipse(250,250,190,190);
fill(0,170,170);
ellipse(250,250,160,160);
fill(0,140,140);
ellipse(250,250,130,130);
fill(0,110,110);
ellipse(250,250,100,100);

fill(0,90,90);
ellipse(250,250,70,70);
fill(0,60,60);
ellipse(250,250,40,40);
fill(0,30,30);
ellipse(250,250,20,20);
fill(0,10,10);
ellipse(250,250,5,5);