let seedStartX;

let seedSize = 5;

function setup() {

  createCanvas(windowWidth, windowHeight);

  background(220);

  seedStartY = height;

  seedStartX = random(0 , width);

  colorMode(HSB);

}

​

function draw() {

  for (let i = 0; i < height; i++) {

    circle(seedStartX + noise(-i, i)/100, seedStartY, seedSize);

    seedStartY = seedStartY - i/100;

    seedSize++;

     if (seedStartY < 0) {

       seedStartY = height;

       seedSize = noise(5);

       seedStartX = random(0 , width);

       fill(random(0,255),random(0,255),random(0,255),random(100));

     }

  }

}

​