let y = 0;

​

function setup() {

  createCanvas(600, 600);

  noStroke();

}

​

function draw() {

 push();

  rotateY(millis() / 1000);

  fill(255, 0, 100,1);

  circle(width/2, height/2, 400);

  pop();

​

  // Draw the rectangles providing the colours of the circle

  for (let i = 0; i < height; i += 20) {

    fill(255 - i / 2.3, 0, 100, 50);

    // stroke(50 + i / 8);

    strokeWeight(0.1);

    stroke(255);

    rect(0, i, width, 19);

  }

​

  // Draw circles rotating around the main circle to create the 'mask'

  for (let i = 0; i < 150; i++) {

    fill(255);

    noStroke();

    x += 0.05;

    y += 0.05;

    let sinX = sin(x) * 350;

    let cosY = cos(y) * 350;

    push();

    // translate(width / 2, height / 2);

    circle(sinX, cosY, 150);

    pop();

  }

}

​