A book in the National Library of Sweden that opens 6 ways…an example of sixfold dos-à-dos binding, it incorporates several text blocks bound between just one set of covers (though each cover is hinged down the middle, and really two covers), but clasps on each side make it possible to read just one of the text blocks at a time, without all the others falling open.
An irresistible challenge as far as a bookbinder is concerned! What fun it would be to make something like this. An OCD planner for today’s renaissance man or woman? Or a journal for a multiple-personality individual, perhaps? LOL