float a = 0;

void setup(){
  size(600,600); 
  frameRate(30);
  strokeWeight(0);
  smooth();
}

void draw() {
  background(0);
  fill(255,0,0);
  ellipse( sin(a)+200, 300*cos(a)+500, random (20), 20);
  ellipse( sin(a)+400, 200*cos(a)+500, 20, random (20));
  ellipse( sin(a)+200, 15*cos(a)+100, 20, 20);
  ellipse( sin(a)+400, 10*cos(a)+200, 20, 20);
  rect(0, 0, 150, 600);
  rect(250, 0, 100, 600);
  rect(450, 0, 200, 600);
  a=a+0.1;
  }