let bob;

​

function setup() {

  createCanvas(400, 400);

  background(42);

}

​

class Bubble {

  constructor(diameter){

    this.x = mouseX;

    this.y = mouseY;

    this.diameter = diameter;

  }

  show(){

    circle(this.x, this.y, this.diameter);

  }

  move(){

    this.x += random(-1,1);

    this.y += random(-1,1);

  }

}

​

function draw() { 

  for(let bubble of arr){

    bubble.show();

    bubble.move();

  }

}

​

function mousePressed() {

  bob = new Bubble(random(1,30));

  arr.push(bob);

}

​