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Part of a series on René Descartes Cartesianism · Rationalism Foundationalism Doubt and certainty Dream argument Cogito ergo sum Trademark argument Mind-body dichotomy Analytic geometry Coordinate system Cartesian circle · Folium Rule of signs · Cartesian diver Balloonist theory Works The World Discourse on the Method La Géométrie Meditations on First Philosophy Principles of Philosophy Passions of the Soul People Christina of Sweden Baruch Spinoza Gottfried Leibniz v • d • e The dream argument is the postulation that the act of dreaming provides preliminary evidence that the senses we trust to distinguish reality from illusion should not be fully trusted, and therefore any state that is dependent on our senses should at the very least be carefully examined and rigorously tested to determine whether it is in fact "reality". Contents 1 Synopsis 2 Simulated reality 3 In popular culture 4 See also 5 Notes // Synopsis While people dream, they usually do not realize they are dreaming (if they do, it is called a lucid dream). This has led philosophers to wonder whether one could actually be dreaming constantly, instead of being in waking reality (or at least that one can't be certain that he or she is not dreaming). In the West, this philosophical puzzle is referred to as early by Plato (Theaetetus 158b-d) and Aristotle (Metaphysics 1011a6). Having received serious attention in René Descartes' Meditations on First Philosophy, the dream argument has become one of the most prominent skeptical hypotheses. In the East, this type of argument is well known as "Zhuangzi dreamed he was a butterfly" (莊周夢蝶 Zhuāngzhōu mèng dié): One night, Zhuangzi(369 BC) dreamed that he was a carefree butterfly, flying happily. After he woke up, he wondered how he could determine whether he was Zhuangzi who had just finished dreaming he was a butterfly, or a butterfly who had just started dreaming he was Zhuangzi. This was a metaphor for what he referred to as a "great dream": He who dreams of drinking wine may weep when morning comes; he who dreams of weeping may in the morning go off to hunt. While he is dreaming he does not know it is a dream, and in his dream he may even try to interpret a dream. Only after he wakes does he know it was a dream. And someday there will be a great awakening when we know that this is all a great dream. Yet the stupid believe they are awake, busily and brightly assuming they understand things, calling this man ruler, that one herdsman ‑ how dense! Confucius and you are both dreaming! And when I say you are dreaming, I am dreaming, too. Words like these will be labeled the Supreme Swindle. Yet, after ten thousand generations, a great sage may appear who will know their meaning, and it will still be as though he appeared with astonishing speed.[1] Simulated reality See also: Simulated reality and Simulation hypothesis Dreaming provides a springboard for those who question whether our own reality may be an illusion. The ability of the mind to be tricked into believing a mentally generated world is the "real world" means at least one variety of simulated reality is a common, even nightly event.[2] Those who argue that the world is not simulated must concede that the mind—at least the sleeping mind—is not itself an entirely reliable mechanism for attempting to differentiate reality from illusion.[3] “ Whatever I have accepted until now as most true has come to me through my senses. But occasionally I have found that they have deceived me, and it is unwise to trust completely those who have deceived us even once. ” —René Descartes [4] In popular culture In Lewis Carroll's Through the Looking-Glass, Alice finds the Red King asleep in the grass; Tweedledum and Tweedledee tell her that the Red King is dreaming about her, and that if he were to wake up she would "go out—bang!—just like a candle." In the 1999 movie The Matrix, machines imprison the human race and plug them into "the Matrix," an enormous machine system that uses human bioelectricity and body heat as biological battery. Connected to the Matrix, the humans are kept in a dream-like state, in which they dream of being in the world as it is today; they have no reason to suspect that it is anything other than the real world. Certain people sense the innate artificiality of the illusion and, through various means, "wake up," breaking free of the Matrix. The overall theme of the series is the "waking dream" scenario, and speculations on which reality is preferable. This concept is further explored during the second Matrix film where one of the main characters appears to be able to utilize abilities usually used in the "dream" in what the character currently believes is "reality", leaving the viewer to question if the character is in fact in reality, or if they are still inside the dream. In the original television series The Twilight Zone, the episode Shadow Play (written by Charles Beaumont, originally aired May 5, 1961, Season 2, Episode 26) concerns a man trapped in a recurring nightmare in which he dreams he is a prison inmate sentenced to death and to be executed; he tries to convince the characters in his dream that they are only figments of his imagination and that they will cease to exist if the execution is carried out. Richard Linklater's Waking Life deals mostly with this subject, revolving around a man being aware of having been trapped inside his own dream. Christopher Nolan's movie Inception deals with the fictional science of shared dreaming. The characters enter others' minds, to steal ideas, or (in the rare case) plant them while the target is unaware they are dreaming. Once in a dream, the characters can enter other layers or dreams within dreams. In the movie, characters can distinguish a dream by using totems which are unique items weighted or otherwise distinguishable to help the user determine reality. In the end, the film leaves open the question of whether the protagonist is himself dreaming, no longer able to distinguish between fantasy and reality. See also Consensus reality Evil daemon False awakening Maya (illusion) Meta-universe Reality in Buddhism Social simulation Solipsism Notes ^ 莊子, 齊物論, 12. Zhuàngzi, "Discussion on making all things equal," 12. from Zhuàngzi, Burton Watson trans., Chuang Tzu (New York: Columbia University Press, 1996), 43. ISBN 9780231105958 [1] ^ Joseph Barbera, Henry Moller, Dreaming, Virtual Reality, and Presence. ^ Giuliana A. L. Mazzoni and Elizabeth F. Loftus, When Dreams Become Reality. ^ René Descartes, Meditations on First Philosophy. v • d • e Skepticism Types Moral · Scientific · Philosophical · Religious · Local · Environmental · Pyrrhonian · Cartesian Skeptical hypotheses Evil genius · Brain in a vat · Dream argument · Omphalos hypothesis Responses Here is a hand · Semantic externalism · Process reliabilism · Closure · Contextualism · Relativism Related articles List of skeptics and skeptical organizations · Jewish skeptics