My Sketch3

let num = 100;

let vecLocation = [];

let vecVelocity = [];

​

function setup() {

  createCanvas(windowWidth, windowHeight);

  frameRate(60);

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

    vecLocation[i] = createVector(width / 2, height / 2);

    vecVelocity[i] = createVector(random(-10, 10), random(-10, 10));

    }

  }

function draw() {

 background(660);

 noStroke(); 

  fill(200, 215, 200); 

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

  vecLocation[i].add(vecVelocity[i]);

  ellipse(vecLocation[i].x, vecLocation[i].y, random(100), random(20,50));

   if (vecLocation[i].x < 0 || vecLocation[i].x > width) {

     vecVelocity[i].x = vecVelocity[i].x * -1;

     }

   if (vecLocation[i].y < 0 || vecLocation[i].y > height) {

     vecVelocity[i].y = vecVelocity[i].y * -1;

     }

  }

}