​

function setup() {

  createCanvas(600, 400);

  blink = createSprite(0, 0, 80, 80);

  blink.velocity.y = 1;

  blink.draw = function() {

    var gray = random(0, 255);

    fill(gray);

    ellipse(mouseX, this.position.y, 80, 80);

  };

}

​

function draw() {

  background(255);

  drawSprites();

}