function setup() {

  createCanvas(windowWidth,

               windowHeight);

  background(100, 100, 100);

  noFill();

  strokeWeight(5);

}



function draw() {

  ellipse(height * 0.1, height * 0.1, height * 0.3);

  ellipse(height * 0.2, height * 0.2, height * 0.6);

  ellipse(height * 0.3, height * 0.3, height * 0.9);

  ellipse(height * 0.4, height * 0.4, height * 1.2);

  ellipse(height * 0.5, height * 0.5, height * 1.5);

  ellipse(height * 0.6, height * 0.6, height * 1.8);

  ellipse(height * 0.7, height * 0.7, height * 2.1);

  ellipse(height * 0.8, height * 0.8, height * 2.4);

  ellipse(height * 0.9, height * 0.9, height * 2.7);

  ellipse(height * 1.0, height * 1.0, height * 3.0);

}