public function getBoundary($box = PageBoundaries::CROP_BOX, $fallback = true)
    {
        $value = $this->getAttribute($box);

        if ($value !== null) {
            return Rectangle::byPdfArray($value, $this->parser);
        }

        if ($fallback === false) {
            return false;
        }

        switch ($box) {
            case PageBoundaries::BLEED_BOX:
            case PageBoundaries::TRIM_BOX:
            case PageBoundaries::ART_BOX:
                return $this->getBoundary(PageBoundaries::CROP_BOX, true);
            case PageBoundaries::CROP_BOX:
                return $this->getBoundary(PageBoundaries::MEDIA_BOX, true);
        }

        return false;
    }