background(0,0,0);
noStroke();
fill(0,0,0);
rect(0,0,500,500);
fill(255,255,0);
ellipse(250,250,500,500);
fill(0,0,0);
rect(250,250,250,250);
fill(255,255,0)
ellipse(375,375,250,250);
fill(0,0,0);
rect(375,375,125,125);
fill(255,255,0)
ellipse(438,438,125,125);
fill(0,0,0);
rect(438,438,63,63);