int numFrames = 50;
int n = 500;

class Thing {
  float x = random(100, 400);
  float y = random(100, 400);
  float radius = random(2,15);
  float size = random(1,2.5);
  float offset =  9*noise(0.02*x, 0.02*y);
   
  void show(){
    stroke(255);
    strokeWeight(size);
    float t = 1.0*(frameCount-1)/numFrames;
    rect(x,y, radius*sin(TWO_PI*t + offset), radius*sin(TWO_PI*t + offset));
    //point(x + radius*cos(TWO_PI*t + offset), y + radius*sin(TWO_PI*t + offset));
  }
}

Thing[] array = new Thing[n];

void setup(){
 size(500,500);

 for(int i=0;i<n;i++){
    array[i] = new Thing();
  }
}

void draw(){
  background(0);

  float t = 1.0*(frameCount-1)/numFrames;

  stroke(255);
  strokeWeight(10);

  for(int i=0;i<n;i++){
    array[i].show();
  }

  if(frameCount<=numFrames){
    saveFrame("fr###.png");
  }
}