let interval = 60;

​

// Position

let x = 0;

let y = 0;

​

function setup() {

  createCanvas(windowWidth, windowHeight);

  noStroke();

}

​

function draw() {

  // Every second, pick a new random position

  if (frameCount % interval == 0) {

    x = random(width);

    y = random(height);

    interval = floor(random(300, 1500));

    background(255);

  }

  // Fill a red spot

  fill(255, 0, 0, 1);

  // Draw the spot

  ellipse(x, y, 100, 100);

}