let y = 0;

let radius = 0;

let circlesPerFrame = 12;

let maxRadius = 200;

​

let r, g, b, maxDeviation;

​

function setup() {

  createCanvas(400, 400);

  background(0);

  noFill();

  frameRate(60);

  r = random(256);

  g = random(256);

  b = random(256);

  maxDeviation = random(-256, 256);

}

​

function randomColor() {

  return color(r + random(maxDeviation), g + random(maxDeviation), b + random(maxDeviation));

}

​

function draw() {

  for (let i = 0; i < circlesPerFrame; i++) {

    stroke(randomColor());

    circle(x, y, radius+i);

  }

  radius += circlesPerFrame;

  if (radius > maxRadius) {

    radius = 0;

    x = random(width);

    y = random(height);

  }

}

​