​

function setup() {

  createCanvas(400 , 400);

  colorMode(HSB, 100);

  noStroke();

}

​

function draw() {

  // Leave the background semi-transparent to see previous circles fade out

  background(0, 0, 0, 10);

  fill(frameCount % 100, 50, 100);

  // Multiple the current noise value by 400 to get the size I want

  let diam = noise(noiseX) * 400;

  circle(200, 200, diam);

  // Increase the noise x position a little bit each tick of the draw loop

  noiseX = noiseX + 0.01;

}