Ehh... Appropriately enough, ambiguity about how I feel about this one abounds. I tried to get at some of what's causing that feeling in a longer review: https://zwieblein.bearblog.dev/robotic-ambiguitys-peek-at-poetic-understanding/ ( )

Letto rapidamente, soprattutto senza le necessarie conoscenze della poesia inglese qui usata come base per la dissertazione. A ogni modo, estremamente utile da (qualsiasi) punto di vista narrativo la riflessione di Empson sul concetto di ambiguità come strumento del racconto.
( )

Here, William Empson introduces a classification scheme for understanding the types of ambiguity to be found in literature. There is a focus on poetry among the types of literature, as it is a better source of effective uses of ambiguity. However, what he says implies to all written content.
What this book does best is to increase the readers’ awareness of ambiguity, and appreciation of how writers can use it in different ways to do different things.
Really a masterpiece of literary criticism, and it should be required reading for those studying English literature. ( )

I got off to a very rocky start with this book — beginning with the first sentence!

"An ambiguity, in ordinary speech, means something very pronounced, and as a rule witty or deceitful."

Skipping over "in ordinary speech" for the moment, I was not aware that ambiguity was "as a rule witty or deceitful." This sentence sent me to two different dictionaries and ultimately — when I was at the library the other day anyway — to the 20-volume Oxford English Dictionary. None of these sources contradicted my presumed definition of "ambiguous" or "ambiguity," but interestingly and as an aside, the OED actually quotes this very sentence in its section of historical usage. For the sake of brevity, let me quote the Concise Oxford English Dictionary:

ambiguous: having more than one meaning; open to different interpretations.

Nowhere in any of my sources — the third being Merriam-Webster's Collegiate Dictionary, Eleventh Edition (2008) — were the words "witty" or "deceitful" to be found.

While Empson's presumably working definition invokes "ordinary speech," his book deals almost exclusively with an analysis of poetry — hardly anybody's concept of ordinary speech. But let us forget about this unfortunate phraseology because it merely detracts from what turns out to be a very useful and important book.

Empson has conceived of seven main types of literary ambiguity along with innumerable subtypes and variations, all of which he illustrates with detailed exegesis of poems, especially from Shakespeare, John Donne and John Dryden. Some of Empson's types are easier to absorb than others, but his explanation of individual poems are highly enlightening and worth the investment of time to understand and overlook his sometimes obscure language.

For example, the first type is so complicated that a complete definition is difficult to sum up and state succinctly, but a single line from Shakespeare will serve to illustrate the idea that "a word or a grammatical structure is effective in several ways at once":

      Bare ruined choirs, where late the sweet birds sang
                              —Sonnet LXXII

". . . because ruined monastery choirs are places in which to sing, because they involve sitting in a row, because they are made of wood, are carved in knots and so forth, because they used to be surrounded by a sheltering building crystallized out of the likeness of a forest, and colored with stained glass and painting like flowers and leaves, because they are now abandoned by all but the gray walls colored like the skies of winter . . . all combine to give the line its beauty, and there is a sort of ambiguity in not knowing which of them to hold most clearly in mind. Clearly this is involved in all such richness and heightening of effect, and the machinations of ambiguity are among the very roots of poetry."

How powerful is that?

Here is another example, the third type of ambiguity, in which two ideas "can be given in one word simultaneously":

                                  Delilah,
      That specious monster, my accomplished snare.
                        —Milton, Samson Agonistes, line 230

The operative word here is specious, which in its original definition meant "beautiful," and only later acquired the meaning of "having deceptive attraction or allure." If you know both meanings, you feel the hidden power of "That specious monster."

Empson refers to these words with double meanings as puns, and technically perhaps they are. Shakespeare's poetry — both sonnets and plays — is full of them, as Empson demonstrates again and again. He directly says that most of the ambiguities he has considered seem beautiful to him — again, not our customary notion of a pun.

The many ambiguities seen in poem after poem make us conscious of the tensions raised by the contradictions if we can see them. The more prominent the contradiction, the greater the tension.

Some critics have argued that Empson's ambiguities are not that at all but merely demonstrate the many creative uses of language in poetry. I see in his analysis something akin to hermeneutics, which originated among Biblical scholars in identifying different levels of interpretation and later made more generally familiar in literary criticism by Norbert Fry. However, one wishes to look at it, Empson's analysis opens us up to a deep understanding of the complexity of poetry. ( )

I found this book to contain much sensitive analysis and a pleasant style, but I traversed it with the sense that I lacked the patience and refinement to take much away from it. Ultimately, the ending cheered me and serves as a better review than anything I could write:

"I should claim, then, that for those who find this book contains novelties, it will make poetry more beautiful, without their ever having to remember the novelties, or endeavor to apply them. It seems a sufficient apology for many niggling pages." ( )