ouroboros

color bg =#ffffff;
color f = #000000;
float x,y, theta, theta2, offset, diam;

void setup() {
  size(500,500);
  background(bg);
  fill(f,5);
  //noStroke();
  //noFill();
  stroke(f,150);
}

void draw() {
  //background(bg);
  offset = map(sq(sin(theta2)),-1,1,-20,30);
  diam = map(sin(theta2),-1,1,30,60);
  x = width/2 + offset + sin(theta)*150;
  y = height/2 + cos(theta)*150;

  ellipse(x,y,diam,diam);

  theta += 0.0523/3;
  theta2 += 0.0523*2;

  println(frameCount);
  if (frameCount % 5 == 0) saveFrame("image-####.gif");
  if (theta > TAU) noLoop();

}