An interesting tidbit from a book describing how paper is
made from wood pulp: "as pulp passes through the rollers of the
papermaking machine -- some of the largest of these measure over two football
fields in length -- the fibers align in the direction they travel, thereby
creating a grain.... (By contrast, a handmade paper is "rough-shake,"
which means of the fibers are distributed randomly across the screen and
therefore have no grain. If you want to
tear a handmade paper, you have to fold it, and possibly score it if it is
thick.)"
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