Processing Evolved

    function setup() {
  let canvas = createCanvas(600, 600, WEBGL);
  canvas.parent('animation-holder');
}

function draw() {
  background(255, 255, 0);
  
  // Draw background dots
  stroke(255);
  for (let i = 0; i < 200; i++) {
    let x = random(-width/2, width/2);
    let y = random(-height/2, height/2);
    let z = random(-500, 0);
    point(x, y, z);
  }
  
  directionalLight(255, 255, 255, 0, 0, -1);
  
  drawFractal(0, 0, 200, 6);
  drawFractal(150, -150, 120, 5);
  drawFractal(-200, 100, 80, 4);
}

function drawFractal(x, y, size, level) {
  if(level > 0) {
    push();
    translate(x, y);
    rotateX(frameCount * 0.01);
    rotateY(frameCount * 0.02);
    if (level % 2 == 0) {
      fill(255, 0, 0);
    } else {
      fill(0, 0, 255);
    }
    box(size);
    
    level--;
    drawFractal(0, size/2, size/2, level);
    drawFractal(0, -size/2, size/2, level);
    drawFractal(size/2, 0, size/2, level);
    drawFractal(-size/2, 0, size/2, level);
    pop();
  }
}