var ball = {

    position: createVector(random(100), random(100)),

    velocity: createVector(random(10), random(10)),

    diameter: random(30, 80),

    r: random(0,256),

    b: random(0,256),

    display: function() {

      noStroke();

      fill(this.r, 150, this.b);

      ellipse(this.position.x, this.position.y, this.diameter, this.diameter);

    // eyes

    fill(0);

    ellipse(this.position.x + 10, this.position.y, 5,8);

    ellipse(this.position.x - 10, this.position.y, 5,8);

    ellipse(this.position.x, this.position.y+10, 8, 5);

    },  // end display method

    move: function() {

      this.position.add(this.velocity);

      if ((this.position.x > width) || (this.position.x < 0)) {

        this.velocity.x = this.velocity.x * -1;

      }

      if ((this.position.y > height) || (this.position.y < 0)) {

        this.velocity.y = this.velocity.y * -1;

      }

    }

  }  // end ball

  return ball;

}