void setup() {
  background(255);
  size(500, 500);
  noFill();
  smooth();
  strokeWeight(3);
  strokeCap(SQUARE);
  stroke(200, 50, 20);
  for ( int i =30; i< 360;i=i+15) {//control distance
    for ( int y =30; y< 360;y=y+15) {// control angle
      arc(250, 250, i, i, 0, radians(y));
    }
  }
}

 void setup() {
  background(255);
  size(500, 500);
  noFill();
  smooth();
  strokeWeight(3);
  strokeCap(SQUARE);
  stroke(200, 50, 20);
  arc(250, 250, 30, 30, 0, radians(30));
  arc(250, 250, 60, 60, 0, radians(60));
  arc(250, 250, 90, 90, 0, radians(90));
  arc(250, 250, 120, 120, 0, radians(120));
  arc(250, 250, 150, 150, 0, radians(150));
  arc(250, 250, 180, 180, 0, radians(180));
  arc(250, 250, 210, 210, 0, radians(210));
  arc(250, 250, 240, 240, 0, radians(240));
  arc(250, 250, 270, 270, 0, radians(270));
  arc(250, 250, 300, 300, 0, radians(300));
  arc(250, 250, 330, 330, 0, radians(330));
  arc(250, 250, 360, 360, 0, radians(360));
}