function setup() {

  createCanvas(400, 400);

}

​

function draw() {

  background(50);

  //1. we developed a simple pinwheel-like shape.

  push();

  translate(width/2,height/2); // sets new vertex

  rotate(frameCount * 0.01); // rotates below stuff

  noStroke();

  ellipse(0,0,100,20);

  ellipse(0,0,20,100);

  pop();

  // issues: reusability. If I want to draw many of this custom shape, I have to copy the block of code many times.

​

}