vase

color bg = #E2D9D0;
color str = #558587;
int num = 40;
Bow[] bows = new Bow[num];

void setup() {
  size(500, 500);
  background(bg);
  noFill();
  stroke(str,150);
  strokeWeight(2);
  float theta = PI/2;
  float y = 90;

  for (int i=0; i<num; i++) {
    bows[i]= new Bow( y, theta);
    theta += TAU/num;
    y += (height-120)/num;
  }
}


void draw() {
  background(bg);
  for (int i=0; i<bows.length; i++) {
    bows[i].display();
  }

  if (frameCount % 3 == 0 && frameCount<121) saveFrame("image-####.gif");
}

class Bow {
  float diam, diam_x, theta, y, sw;

  Bow(float _y, float _theta) {
    y = _y;
    theta = _theta;
  }

  void display() {
    diam = map(cos(theta), -1, 1, 20, 150);
    diam_x = map(cos(theta), -1, 1, 100, 250);
    sw = map(cos(theta), -1, 1, 1, 10);
    strokeWeight(sw);
    //line(0, y, 150, y);
    arc(width/2, y, diam_x, diam, PI, TAU);
    //line(350, y, 500, y);
    theta += 0.0523;
  }
}