This 17th-century dos-a-dos structure opens in six directions. The video gives an idea of the beauty and refined technique with which this artifact was created. It is a true masterpiece of printing and bookbinding crafts.
Four years ago Erik Kwakkel, a Medieval book historian at Leiden University in the Netherlands, broke the internet with a gif showing a similar book. Dos-a-dos demonstrated in his post was an older tome originating from the 16th-century Germany. Here, at the Flickr account of the National Library of Sweden, you may find more photos of that book.