boolean  variation  = false;

void setup()
{
  size(600, 600);
  frameRate(30);
  smooth();
  noFill();
  noStroke();
}

void mousePressed()
{
  variation = ! variation;
}

void draw()
{
  float  fr     = radians(frameCount),
         speed  = fr * 2,
         sfr    = sin(fr);
  
  background(0, 0, 31);
  translate(width / 2, height / 2);
  rotate(fr);
  scale(height / sq(20 + 10 * (1 + sin(fr / 2))));

  for (int j = -15; j < 15; j++)
  {
    for (float i = 0; i < 2 * PI; i += PI / 8)
    {
      float  x = sin(i + speed),
             y = cos(i + speed) / 2;
      
      float  r1 = (100 + y * 20) * y,
             r2 = (100 + y * 20) / 2;

      float  o  = 15 + y * 480,
             a = noise(i + j) + noise(frameCount) / 10;

      fill(o - a * 255 + 64 * sfr, a * 31 + 192 * sfr,  127 + a * o - 31 * sfr, o);
      stroke(192, 127 + o / 2);
      if (variation)
        y += 2 * sin(fr + i);
      ellipse(width / 4 * x + 100 * sin(radians(11 + j + frameCount * 0.1) * 30), height / 4 * y + j * height / 8, r1, r2);
    }
  }
}