ejercicio processing

size(500, 500);background(1);noStroke();fill(10);quad(160, 160, 340, 160, 340, 340, 160, 340);fill(20);quad(210, 210, 290, 210, 290, 290, 210, 290);fill(50);quad(250, 200, 200, 250, 250, 300, 300, 250);fill(100);ellipse(160, 160, 40, 40);ellipse(340, 340, 40, 40);ellipse(340, 160, 40, 40);ellipse(160, 340, 40, 40);fill (200);quad(50, 10, 120, 10, 120, 200, 80, 200);quad(200, 80, 200, 120, 10, 120, 10, 50); quad(300, 80, 300, 120, 490, 120, 490, 50);quad(50, 490, 120, 490, 120, 300, 80, 300); quad(450, 490, 380, 490, 380, 300, 420, 300);quad(450, 10, 380, 10, 380, 200, 420, 200);quad(200, 420, 200, 380, 10, 380, 10, 450);quad(200, 420, 200, 380, 10, 380, 10, 450);quad(300, 420, 300, 380, 490, 380, 490, 450);