broken

ArrayList thingies = new ArrayList();
float limit, r1, r2, org_x, org_y;
float sw = 70;
float diam = 350;
color bg = #3C3658;
color s = #F7E0AE;

void setup() {

  size(500, 500);
  background(bg);
  strokeCap(SQUARE);
  noFill();

  org_x = width/2;
  org_y = height/2;

  float theta = 0;
  float start = 0;
  float end = 0;

  while (end < 360) {
    r1 = random(1, 3);
    r2 = random(10, 20);
    theta = random(TAU);
    start = end + r1;
    end = start + r2;
    Thingie thingie = new Thingie(theta, start, end);
    thingies.add(thingie);
  }
}

void draw() {
  background(bg);
  for (int i=0; i<thingies.size();i++) {
    Thingie thing = (Thingie) thingies.get(i);
    thing.run();
  }

  //if (frameCount % 4 == 0 && frameCount <220) saveFrame("image-###.gif");
}

class Thingie {
  float theta, t, start, end;

  Thingie(float _theta, float _start, float _end) {
    theta= _theta;
    start = radians(_start);
    end = radians(_end);
  }

  void run() {
    move();
    display();

  }

  void move() {
    t = map(sin(theta),-1, 1, 0.0523, 0.0523/4);
    theta += t;

    start += t;
    end += t;

  }

  void display() {
    //stroke(s,50);
    strokeWeight(sw);
    fill(s,50);
    noFill();
    stroke(s,150);
    arc(org_x,org_y,diam,diam,start,end);
  }
}