var t = 0;

​

function setup() {

  createCanvas(400, 400);

  stroke(0, 18);

  noFill();

}

​

function draw() {

  var x1 = width * noise(t + 15);

  var x2 = width * noise(t + 25);

  var x3 = width * noise(t + 35);

  var x4 = width * noise(t + 45);

  var y1 = height * noise(t + 55);

  var y2 = height * noise(t + 65);

  var y3 = height * noise(t + 75);

  var y4 = height * noise(t + 85);

​

  bezier(x1, y1, x2, y2, x3, y3, x4, y4);

​

  t += 0.005;

​

  // clear the background every 500 frames using mod (%) operator

  if (frameCount % 500 == 0) {

    background(255);

  }

}