It is a rather silly notion that, with each new poem, the author must “invent” something new. And it goes hand in hand with this other idea that the greatest poet is the one who has employed the greatest number of formulas, who has explored the widest range of compositional possibilities, who, in short, “has not repeated himself.” That is why versification manuals, after a certain point, begin to grow tiresome. The same is true of treatises on stylistics. There comes a point where the essential seems long since surpassed, and the text begins to dwell on the irrelevant. The student is left with the feeling that his noble interest is being trivialized, and that art itself is of little value.