Party time - OpenProcessing

mySketch
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let vecLocation = [];
let vecVelocity = [];
const NUM = 10;
​
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(0);
  noStroke();
  fill(random(0,255),random(0,255),random(0,255));
  for(let i = 0;i < NUM; i++){
   ellipse(vecLocation[i].x,vecLocation[i].y,90,90);
    vecLocation[i].add(vecVelocity[i]);
    if(vecLocation[i].x > width || vecLocation[i].x < 0){
      vecVelocity[i].x = vecVelocity[i].x * -1;
    }
   if(vecLocation[i].y > height || vecLocation[i].y < 0){
      vecVelocity[i].y = vecVelocity[i].y * -1;
    }
 }
}