When printing double-sided, "flipping on the long axis" allows pages to turn like a book, while "short axis" ensures the image is not upside down when turned, as seen in folio and mint tin mats.
Artists often "flip" their work digitally or physically to identify structural issues that are otherwise invisible to the creator. filpped
Keep drawings within the outer two-thirds of the page to ensure they are visible while flipping. When printing double-sided, "flipping on the long axis"