colorMode(HSB, 360);
  noStroke();
  for(int i = 0; i < 360; i += 30){
    float x = cos(radians(i)) * 35 + width / 2;
    float y = sin(radians(i)) * 35 + height / 2;
    fill(i, 360, 360);
    ellipse(x, y, 15, 15);
  }