There is evidence that we build a mental map of the story based on a book's physical characteristics. Then we can pinpoint some events in the storyline because

There is evidence that we build a mental map of the story based on a book's physical characteristics. Then we can pinpoint some events in the storyline because we know more or less the physical location on those events in the book (the object). Eg: when we read the book, turning pages, we build the storyline in our head but also a map based on the physical path of the pages.