let s = 5;

​

function setup() {

  createCanvas(400, 400);

  background(0);

}

​

function draw() {

  drawEllipse();

}

​

function drawEllipse() {

  stroke(random(5, 255), random(5, 255), random(5, 255));

  noFill();

  rectMode(CENTER);

​

  rect(200, 200, ellipseSize, ellipseSize, s);

​

  if(ellipseSize > 1) {

    ellipseSize -= 5;

  } else {

    ellipseSize -= 0.00001;

  }

  s++;

}

​