function setup() {

  createCanvas(windowWidth,

               windowHeight);

  background(234, 234, 234);

  noFill();



  for (var i = 0; i < 1000; i = i + 1) {

    stroke(random(100, 255), random(50, 255), random(0, 255));

    ellipse(windowWidth / 2, windowHeight/ 2, i * 2);

  }

}



function draw() {



}