The Uncanny (Ger. Das Unheimliche -- literally, "un-home-ly", but idiomatically, "scary", "creepy") is a Freudian concept of an instance where something can be familiar, yet foreign at the same time, resulting in a feeling of it being uncomfortably strange. (See Uncanny valley)
Because the uncanny is familiar, yet strange, it often creates cognitive dissonance within the experiencing subject due to the paradoxical nature of being attracted to, yet repulsed by an object at the same time. This cognitive dissonance often leads to an outright rejection of the object, as one would rather reject than rationalize.
The state is first identified by Ernst Jentsch in a 1906 essay, On the Psychology of the Uncanny. Jentsch defines the Uncanny as: being a product of "intellectual uncertainty; so that the uncanny would always, as it were, be something one does not know one’s way about in. The better orientated in his environment a person is, the less readily will he get the impression of something uncanny in regard to the objects and events in it.", and expands upon its use in fiction:
In telling a story one of the most successful devices for easily creating uncanny effects is to leave the reader in uncertainty whether a particular figure in the story is a human being or an automaton and to do it in such a way that his attention is not focused directly upon his uncertainty, so that he may not be led to go into the matter and clear it up immediately.
Jentsch identifies German writer E.T.A. Hoffmann as a writer who utilizes uncanny effects in his work, focusing specifically on Hoffmann's story "The Sandman" ("Der Sandmann"), which features a life-like doll, Olympia.
The concept of the Uncanny was later elaborated on and developed by Sigmund Freud in his 1919 essay The Uncanny, which also draws on the work of Hoffmann (whom Freud refers to as the "unrivalled master of the uncanny in literature"). However, he criticizes Jentsch's belief that Olympia is the central uncanny element in the story:
I cannot think — and I hope most readers of the story will agree with me — that the theme of the doll Olympia, who is to all appearances a living being, is by any means the only, or indeed the most important, element that must be held responsible for the quite unparalleled atmosphere of uncanniness evoked by the story.
Instead, Freud draws on a wholly different element of the story, namely, "the idea of being robbed of one's eyes," as the "more striking instance of uncanniness" in the tale.
Freud goes on, for the remainder of the essay, to identify uncanny effects that result from instances of "repetition of the same thing," including incidents wherein one becomes lost and accidentally retraces one's steps, and instances wherein random numbers recur, seemingly meaningfully (here Freud may be said to be prefiguring the concept that Jung would later refer to as synchronicity). He also discusses the uncanny nature of Otto Rank's concept of the "double."
Freud specifically relates an aspect of the Uncanny derived from German etymology. By contrasting the German adjective unheimlich with its base word heimlich ("concealed, hidden, in secret"), he proposes that social taboo often yields an aura not only of pious reverence but even more so of horror and even disgust, as the taboo state of an item gives rise to the commonplace assumption that that which is hidden from public eye (cf. the eye or sight metaphor) must be a dangerous threat and even an abomination - especially if the concealed item is obviously or presumingly sexual in nature. Basically, the Uncanny is what unconsciously reminds us of our own Id, our forbidden and thus repressed impulses perceived as a threatening force by our super-ego ridden with oedipal guilt as it fears symbolic castration by punishment for deviating from societal norms. Thus, the items and individuals that we project our own repressed impulses upon become a most uncanny threat to us,uncanny monsters and freaks akin to fairy-tale folk-devils, and subsequently often become scapegoats we blame for all sorts of perceived miseries, calamities, and maladies.
What interests us most in this long extract is to find that among its different shades of meaning the word heimlich exhibits one which is identical with its opposite, unheimlich. What is heimlich thus comes to be unheimlich. [...] In general we are reminded that the word heimlich is not unambiguous, but belongs to two sets of ideas, which, without being contradictory, are yet very different: on the one hand it means what is familiar and agreeable, and on the other, what is concealed and kept out of sight. Unheimlich is customarily used, we are told, as the contrary only of the first signification of heimlich, and not of the second. [...] On the other hand, we notice thatSchelling says something which throws quite a new light on the concept of the Unheimlich, for which we were certainly not prepared. According to him, everything is unheimlich that ought to have remained secret and hidden but has come to light.[...]A study of dreams, phantasies and myths has taught us that anxiety about one's eyes, the fear of going blind [as used as a central theme in The Sandmann], is often enough a substitute for the dread of being castrated. The self-blinding of the mythical criminal, Oedipus, was simply a mitigated form of the punishment of castration — the only punishment that was adequate for him by the lex talionis. [...] All further doubts are removed when we learn the details of their 'castration complex' from the analysis of neurotic patients, and realize its immense importance in their mental life.[...]Moreover, I would not recommend any opponent of the psycho-analytic view to select this particular story of the Sand-Man with which to support his argument that anxiety about the eyes has nothing to do with the castration complex. For why does Hoffmann bring the anxiety about eyes into such intimate connection with the father's death? And why does the Sand-Man always appear as a disturber of love?
After Freud, Jacques Lacan, in his seminar 1962–1963 "L'angoisse" ("Anxiety"), utilized the Unheimlich "via regia" to enter into the territory of Angst. Lacan showed in a very clear manner how, the same image which seduces the subject trapping him in the narcissistic impasse, may suddenly, by a contingency, show that it is dependent on something, some hidden object, and so the subject may grasp at the same time that he is not autonomous (5 December 1962). For example and paradigm, Guy de Maupassant, in his story "L'horla", describes a man who suddenly may see his own back in the mirror. His back is there, but it is deprived of the gaze of the subject. It appears as a strange object, until he feels it is his own. There is no cognitive dissonance here, we rather cross all possible cognition, to find ourselves in the field where we do not know how to distinguish bad and good, pleasure from displeasure. And this is the signal of anxiety: the signal of the real, as irreducible to any signifier. Hitchcock was the master in the art of conducing art into the world of Unheimlich. He used simple, everyday objects who may suddenly lose their familiar side, and become the messenger of beyond narcissism.
Canny is from the Anglo-Saxon root ken: “knowledge, understanding, or cognizance; mental perception: an idea beyond one's ken.” Thus the uncanny is something outside one's familiar knowledge or perceptions.