BubbleMickey

int frames = 60;
int thingies = 800;
Thingie[] th = new Thingie[thingies];

void setup() {
  size(500, 500);
  noStroke();

  for (int i = 0; i < thingies; i++) {
    th[i] = new Thingie(random(width), random(height), random(1, 3), random(-0.1, 0.1), random(20,50));
  }
}

void draw() {
  background(255,0,0);
  float t = (frameCount % frames)/float(frames);
  for (int i=0; i<frames;i++) {
    th[i].draw(t);
  }
  displayMask();
  saveFrame("image#####.gif");
  if (frameCount == frames) noLoop();
}

void displayMask() {
  float orgX = width/2;
  float orgY = height/2;
  PGraphics mask = createGraphics(width, height);
  mask.beginDraw();
  mask.background(0);
  mask.fill(255);
  mask.noStroke();
  for (int i=0; i<2; i++) {
    mask.ellipse(width/4+ width/2*i, height/4+40, width*.3, width*.3);
  }
  mask.ellipse(orgX, orgY+40, width*.5, width*.5);
  mask.endDraw();
  mask.filter(BLUR);
  blend(mask, 0, 0, width, height, 0, 0, width, height, DARKEST);
}
class Thingie {
  float x, y, scale, rotation, sz;

  Thingie(float _x, float _y, float _scale, float _rotation, float _sz) {
    x = _x;
    y = _y;
    scale = _scale;
    rotation = _rotation;
    sz = _sz;
  }

  void draw(float time) {
    resetMatrix();
    scale(scale);
    translate(x, y);
    rotate(rotation);
    fill(255,255,0,200);
    ellipse(0,-time*height+height, sz, sz);
    ellipse(0,-time*height, sz, sz);
  }
}