var Xpos=[100,200,300,150,125,170,250,350,50,20,70,90,390,310]

var Ypos=[20,80,80,290,100,125,150,200,255,35,200,220,270,390]

 function setup() {

  createCanvas(400, 400);

}

​

function draw() {

  background(0);

  fill(random(255),random(255),random(255))

  if(Xpos.length<200){

     Xpos.push(random()*400)

     Ypos.push(random()*10-5)

     }

  var i=0

  while(i<Xpos.length){

    ellipse(Xpos[i], Ypos[i],5,200)

    Ypos[i]++;

    Ypos[i]*=1.06;

    i++

    if(Ypos[i]>400){

       Ypos[i]=0;

       }

  }

}