transformation

function setup() {
  var canvas = createCanvas(500, 500);
  canvas.parent('sketch');
  colorMode(HSB);
  rectMode(CENTER);
}

var angle = 0;

function draw() {
  background(98);
  translate(width / 2, height / 2);
  for (var angle = 0; angle < 180; angle += 12) {
    push();
    rotate(radians(angle));
    noFill();
    stroke(15);
    strokeWeight(0.5);
    rect(0, 0, width / 3, height / 3);
    pop();
  }
}