​

function setup() {

  createCanvas(400, 400);

  background(220);

}

function draw() {

  let currentTime = millis();

​

​

  if (currentTime - lastTime > 500) {

    background(220);

    let rectX = random(0, width - 50);

    let rectY = random(0, height - 50);

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

    rect(rectX, rectY, 50, 50);

    lastTime = currentTime;

  }

}

​