var time;100



function setup() {

  createCanvas(windowWidth,

               windowHeight);

  noFill();

  strokeWeight(3);

  time = 0;

}



function draw() {

  background(234, 35, 78);



  for (var i = 0; i < 10; i = i + 1) {

    var ticktack = 1 + sin(time + i);

    stroke(100, 200, i * (200 / 10));

    strokeWeight(windowWidth / 15 * ticktack);

    ellipse(windowWidth / 2, windowHeight / 2, windowHeight / 10 * i);

  }



  time = time + 0.2;

}