let numBubbles = 100;

let gravity;

​

function setup() {

  createCanvas(1000, 1000);

  rectMode(CENTER);

​

  for (let i=0; i < numBubbles; i++) {

    bubbles.push(new Bubble(random(0, width), random(0, height)));

  }

  gravity = createVector(0, 0.1);

}

​

​

function draw() {

  background(180, 200, 350);

  for (let i = 1; i < numBubbles; i++) {

    bubbles[i].applyForce(gravity);

    bubbles[i].update();

    bubbles[i].display();

  }

}