public Shape getDownPointerShape() {
        Path2D shape = new Path2D.Double();
        shape.moveTo(+0.50 * SIZE, +0.28 * SIZE);
        shape.lineTo(+0.50 * SIZE + 0.7 * POINTER_SIZE, +0.28 * SIZE - POINTER_SIZE);
        shape.lineTo(+0.50 * SIZE - 0.7 * POINTER_SIZE, +0.28 * SIZE - POINTER_SIZE);