var circles = 12, 

        delta = 0,

        frames = 100;

function setup() {

  createCanvas(450, 450);

}

function draw() {

  background(50);

  stroke(0,200,200);  

    noFill();

  for (var i=0; i<circles; i++) {

    var size = i*35;

    var weight = map(sin(delta+TWO_PI/circles*i), -1, 1, 1, 16);

    strokeWeight(weight);  

    ellipse(width/2, height/2, size, size);

  }

  delta += TWO_PI/frames;

}

body {

  background: #323232;

}

canvas {

  display: block;

  margin: auto;

}

<script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/0.5.7/p5.min.js"></script>