Hi Gladys,
You are right to point out that poetry often relies on allusions. Shakespeare, as a dramatic poet, uses allusions frequently and skillfully. One of my favorite allusions in Hamlet comes in Act 5, scene 2, when Hamlet dismisses Horatio's suggestion that the duel with Laertes be postponed. Horatio senses Hamlet's life may be at risk, but Hamlet shrugs him off, saying:
Not a whit, we defy augury: there's a special providence in the fall of a sparrow. If it be now, 'tis not to come; if it be not to come, it will be
now; if it be not now, yet it will come: the readiness is all:
Hamlet's allusion is to comforting passage from the Gospel of Matthew, "Are not two sparrows sold for a farthing? and one of them shall not fall on the ground without your Father. But the very hairs of your head are all numbered. Fear ye not therefore, ye are of more value than many sparrows" (KJV 10:29-31).
As this example demonstrates, a literary allusion is a linking device that connects something within a character's immediate experience to something beyond it. In a play, an allusion may make a close reference (e.g. to a previous scene, earlier dialogue, or character) or a distant reference (e.g. to another text, a historical event, etc.). In order for a figure of speech to qualify as an allusion the reference must be apparent and if not, the reference must be capable of being explained using non-subjective evidence and logical reasoning. If someone wishes to establish the validity of a non-apparent allusion, the individual carries the burden of proof to demonstrate his or her allusion is valid beyond a reasonable doubt.
Ray has discovered what he believes are significant allusions and other rhetorical devices that reveal a hidden structure and meaning in Hamlet. Like you, I think his work is imaginative and provocative; however, I disagree with your contention that his study has actually uncovered allusions.
While an allusion is an indirect reference, by definition it cannot be a private code. For a figure of speech to operate as an allusion, a larger audience of readers must grasp the reference. In other words, an allusion must not be so arcane or obscure that the reference is understood by only one person.
Rather than discovering allusions, it is more accurate to say that Ray is practicing a form of post-structuralist interpretation called intertextuality. Intertextuality rejects the idea that a text or portion of a text possesses independent or objective meaning. Instead, the meaning of a text is distilled, often unconsciously, by personal and cultural filters operating within and without the reader. Such interpretations are the property of the reader and beyond dispute. They are true because the reader finds them to be true.