self.push(self.root)

        self.push(self.root)

        draw.rectangle((0, 0, self.width, self.height), (0, 0, 0))

            draw.rectangle((l, t, r - 1, b - 1), quad.color)

            draw.rectangle((l, t, r - 2, b - 2), quad.color)

    model = Model('butterfly.jpg')

    model = Model('starry.png')