for (int a=0;a<700;a+=50){
for (int b=0;b<700;b+=50){
ellipse(450, 50, 10, 10);
ellipse(400, 100, 20, 20);
ellipse(350, 150, 30, 30);
ellipse(300, 200, 40, 40);
ellipse(250, 250, 50, 50);
ellipse(200, 300, 40, 40);
ellipse(150, 350, 30, 30);
ellipse(100, 400, 20, 20);
ellipse(50, 450, 10, 10);
ellipse(250,250,300,300);
ellipse(250,250,100,100);
ellipse(250,250,200,200);
ellipse(250,250,400,200);
ellipse(250,250,200,400);
ellipse(250,250,500,100);
ellipse(250,250,100,500);
ellipse(100, 100, 20, 20);
ellipse(150, 150, 30, 30);
ellipse(200, 200, 40, 40);
ellipse(300, 300, 40, 40);
ellipse(350, 350, 30, 30);
ellipse(400, 400, 20, 20);
ellipse(450, 450, 10, 10);
ellipse(250, 250, 50, 50);