
While standing in one of the Overlook hotel's corridors, Danny wears an 'Apollo 11' sweater. This is a hint from Kubrick that Danny represents the Greek sun god, Apollo, twin brother of the goddess Artemis. Apollo was also associated with medicine and healing; recall that Dick Hallorann calls Danny "Doc" at one point. (Just after Hallorann calls Danny this, Wendy tells him that Doc is a nickname sometimes used for Danny by Jack and herself).
Recall from earlier in the analysis that Wendy represents Artemis, the Greek moon goddess. Since Danny represents Apollo, the sun god (see screencap above), Wendy's desired incestuous union with Danny (once she's gotten rid of Jack) is to be a union between sun (Sol) and moon (Luna). Jung discusses such a union in his Mysterium Coniunctionis:[a]
"The conflict between worldliness and spirituality, latent in the love-myth of Mother and Son, was elevated by Christianity to the mystic marriage of sponsus (Christ) with sponsa (Church), whereas the alchemists transposed it to the physical plane as the coniunctio of Sol and Luna. The Christian solution of the conflict is purely pneumatic, the physical relations of the sexes being turned into an allegory or - quite illegitimately - into a sin that perpetuates and even intensifies the original one in the Garden. Alchemy, on the other hand, exalted the most heinous transgression of the law, namely incest, into a symbol of the union of opposites, hoping in this way to bring back the golden age."
"Generally Sol is regarded as the masculine and active half of Mercurius, a supraordinate concept whose psychology I have discussed in a separate study ("The Spirit Mercurius"). Since, in his alchemical form, Mercurius does not exist in reality, he must be an unconscious projection, and because he is an absolutely fundamental concept in alchemy he must signify the unconscious itself. He is by his very nature the unconscious, where nothing can be differentiated; but, as a spiritus vegetativus (living spirit), he is an active principle and so must always appear in reality in differentiated form. He is therefore fittingly called "duplex," both active and passive. The "ascending" active part of him is called Sol, and it is only through this that the passive part can be perceived. The passive part therefore bears the name of Luna, because she borrows her light from the sun. Mercurius demonstrably corresponds to the cosmic Nous of the classical philosophers. The human mind is a derivative of this and so, likewise, is the diurnal life of the psyche, which we call consciousness. Consciousness requires as its necessary counterpart a dark, latent, non-manifest side, the unconscious, whose presence can be known only by the light of consciousness. Just as the day-star rises out of the nocturnal sea, so, ontogenetically and phylogenetically, consciousness is born of unconsciousness and sinks back every night to this primal condition. This duality of our psychic life is the prototype and archetype of the Sol-Luna symbolism."
According to Hauck, "The Rosarium depicts the sacred marriage in a series of 20 woodcuts showing Sol and Luna in various stages of conjunction. As the sacred marriage progresses, the male essence or Sol, representing spirit or energy, merges completely with the female essence or Luna, representing soul or matter.
"As depicted in the Rosarium, this union is achieved through coitus or the sexual union of Sol and Luna. Their lovemaking symbolizes the mystical union of opposites. The bride represents the soul or incarnate self, and the bridegroom represents the spirit or disincarnate self."
As suggested by Wendy's actions in the above scenes, she desires to achieve a sexual union with Danny.
Continuing with Hauck,
"The product of this sacred marriage, the child of Sol and Luna, is a new archetype known as the Divine Child or Divine Androgyne. This is the same archetype as the alchemical hermaphrodite or Rebis (the double thing)."[b]
The above explains why Wendy choked Danny during sex with him: As described earlier in the analysis, Wendy hoped to increase Danny's state of arousal during sex, to the point where he could impregnate her. Wendy's ultimate goal is to have a child with Danny - this is why she wants to do away with Jack. All of this indicates that the woman in the red VW wanted to have a child with her own 13-year-old son, and that she mentioned this to Susan Robertson at the accident scene. Danny represents, in part, Susan's own son in the dream, and since he is 6 years old, he is, theoretically, not capable of impregnating a woman; but, as stated earlier in the analysis, Danny 'incorporates' certain abilities of the 13-year-old boy, in specific, the ability to ejaculate, and therefore to impregnate a woman. The fact that the two boys are, in this sense, 'combined' in the dream, is consistent with the 'fantasy' aspect of dream-logic. The older woman's plan to conceive a child with her son, became Susan's wish for herself and her own son, and this wish became the basis for her dream, insofar as the dream represents the fulfillment of the part of the wish requiring that she eliminate her husband, in order to be alone with her son. In accordance with the alchemical symbolism discussed above, the child conceived by Susan with her son, would be a kind of 'ultimate' hermaphrodite.
a. Jung, C.G. The Collected Works of C.G. Jung, Vol 14. Princeton University Press, 1977. pp. 90-91, 96-97.
b. Hauck, Dennis William. The Complete Idiot's Guide to Alchemy. New York: Penguin Group, 2008. Google Books, p. 263. URL = https://books.google.com.