let min = 1

​

const circles = []

function setup() {

  createCanvas(400, 400);

  for (let i = 0; i < 20; i++) {

    circles.push(new Circle(random(width), random(height)))

  }

}

​

function draw() {

  background(0);

  circles.forEach(circle => {

    circle.update()

    circle.render()

  })

}

​

class Circle {

  constructor(x, y) {

    this.r = random(min, max)

    this.x = x

    this.y = y

    this.t = this.r

  }

  update() {

    this.r = map(noise(this.t), 0, 1, min, max)

    this.t+= 0.015

  }

  render() {

    noStroke()

    ellipse(this.x, this.y, this.r, this.r)

  }

}