There must be a "surprise quotient" to poetry. A surprising juxtaposition, transition, metaphor -- would it be, as a minimum, every other line? Three lines? Yet-- apt. Apt. Gotta be apt. Apt, happily. Happily apt.
Here I am, trying to quantify the (perhaps) unquantifiable. What's behind this urge to quantify? Eliminate surprise? Why do that? Isn't surprise what I want to celebrate? Imagine reading -- or writing -- with a surprise meter! Measuring surprises.
How boring! How positively boring!!!
(Isn't that the same as... negatively interesting? Perhaps....)