The pun in the title is that the reader very literally builds the story as he or she goes through it, piecing together something larger from the booklets.
A question for the history of the graphic novel: Will anyone ever write a cartoon equivalent of Moby-Dick, The Adventures of Huckleberry Finn, or For Whom the Bell Tolls?
The inside covers of the books are marked with a pair of maps, essentially bookending history with cartography.