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History Main / PerceptionFilter

17th May '16 6:53:47 PM Luigifan
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Your standard invisibility typically makes you transparent to light. While quite effective, it does have a number of catches, since you usually can be heard or otherwise detected. Not to mention that you would be completely blind if it worked realistically.[[note]] Your eye works by absorbing light energy and converting it into electric impulses in your nerves. Thus, being transparent means no light absorption, causing no electric signals being generated and making you blinder than a bat, which it turns out can generally see quite well.[[/note]] So it's actually not a good way of being stealthy.

Perception filter does not have these catches, because it affects the minds of the observers, making them subconsciously look in another direction or pay no attention to the subject, or erasing the subject from short term memory. It does have a few catches of its own, though: it obviously doesn't work on cameras and other objects that don't have a mind to screw with.

Very often used by witches in {{fantasy}}, aliens in {{science fiction}} and anyone else trying to pass unnoticed amoung {{muggle}}s.

See also: WeirdnessCensor where it's the Muggles themselves that choose to ignore it, InvisibleToNormals where it's the laws of nature that causes it, TheNondescript where it's something/someone so unremarkable no one gives them a second thought. Compare JediMindTrick.

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Your standard invisibility typically makes you transparent to light. While quite effective, it does have a number of catches, since you usually can be heard or otherwise detected. Not to mention that you would be completely blind if it worked realistically.[[note]] Your [[note]]Your eye works by absorbing light energy and converting it into electric impulses in your nerves. Thus, being transparent means no light absorption, causing no electric signals being generated and making you blinder than a bat, which it turns out can generally see quite well.[[/note]] So it's actually not a good way of being stealthy.

Perception filter does not have these catches, because it affects the minds of the observers, making them subconsciously look in another direction or pay no attention to the subject, or erasing the subject from short term short-term memory. It does have a few catches of its own, though: it obviously doesn't work on cameras and other objects that don't have a mind to screw with.

Very often used by witches in {{fantasy}}, aliens in {{science fiction}} fiction}}, and anyone else trying to pass unnoticed amoung {{muggle}}s.

See also: WeirdnessCensor WeirdnessCensor, where it's the Muggles themselves that choose to ignore it, InvisibleToNormals InvisibleToNormals, where it's the laws of nature that causes it, TheNondescript and TheNondescript, where it's something/someone so unremarkable that no one gives them a second thought. Compare JediMindTrick.



* In ''Anime/GhostInTheShell'''s {{cyberpunk}} future, most people have cybernetic eye-implants, which allows sufficiently skilled hackers to essentially edit themselves out of people's vision; this trick is used in ''Anime/GhostInTheShellStandAloneComplex'' by the [[AntiVillain Laughing Man]] [[spoiler: and Major when she's impersonating him.]]

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* In ''Anime/GhostInTheShell'''s {{cyberpunk}} future, most people have cybernetic eye-implants, which allows sufficiently skilled hackers to essentially edit themselves out of people's vision; this trick is used in ''Anime/GhostInTheShellStandAloneComplex'' by the [[AntiVillain Laughing Man]] [[spoiler: and [[spoiler:and Major when she's impersonating him.]]
8th May '16 11:22:51 AM TSBasilisk
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* In ''LightNovel/KumoDesuGaNaniKa'' Shiraori uses a spell to keep people from staring at or bothering her due to her exotic beauty. People who see her will think she has not outstanding features and will only recall "white". Repeated exposure or knowing her appearance breaks the spell.
19th Apr '16 9:58:59 AM BreadBull
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* In the ''Literature/PercyJacksonAndTheOlympians'' series, the Mist serves this function: it blurs Greek mythological elements to all mortals (except those with the unique ability to see through it) and replaces them with something they can understand. For instance, a sword might look like a shotgun, and a hellhound can run through Manhattan unnoticed because everyone thinks it's a truck. Hence, there is a good reason why it's impossible for us to find a way to the 600th floor of the Empire State Building.
** It can affect demigods, too: in ''Sea of Monsters'', when Tyson (a Cyclops) is outside Camp Half-Blood, Percy has to concentrate very hard or else it will appear to him that Tyson has two eyes instead of one.
** Deconstructed in the second volume: It turns out there's a second [[spoiler:Roman]] Camp Half-Blood, but because of the mist the campers don't ever remember them as what they really were: half-bloods. Then you realize that Percy and other half-bloods throughout history have fought and killed some VERY peculiar monsters who seemed... almost human...
19th Apr '16 9:56:54 AM BreadBull
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See also: WeirdnessCensor, InvisibleToNormals, TheNondescript. Compare JediMindTrick.

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See also: WeirdnessCensor, InvisibleToNormals, TheNondescript.WeirdnessCensor where it's the Muggles themselves that choose to ignore it, InvisibleToNormals where it's the laws of nature that causes it, TheNondescript where it's something/someone so unremarkable no one gives them a second thought. Compare JediMindTrick.
27th Feb '16 9:56:53 AM ScroogeMacDuck
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Perception filter does not have these catches, because it affects the minds of the observers, making them subconsciously look in another direction or pay no attention to the subject, or erasing the subject from short term memory. It typically doesn't work on cameras and other objects that don't have a mind to screw with.

to:

Perception filter does not have these catches, because it affects the minds of the observers, making them subconsciously look in another direction or pay no attention to the subject, or erasing the subject from short term memory. It typically does have a few catches of its own, though: it obviously doesn't work on cameras and other objects that don't have a mind to screw with.
24th Feb '16 6:47:25 PM MisterTulip
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* In FanFic/FistOfTheMoon, it becomes a RunningGag that the perception filter that protects the Senshi's identity doesn't work at all, though [[spoiler: it's because the Senshi have accidentally infuses the ones who can see through it with magic that nullifies the censor.]]

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* In FanFic/FistOfTheMoon, ''FanFic/FistOfTheMoon'', it becomes a RunningGag that the perception filter that protects the Senshi's identity doesn't work at all, though [[spoiler: it's because the Senshi have accidentally infuses the ones who can see through it with magic that nullifies the censor.]]]]
* In ''Fanfic/TheWitchOfTheEverfree'', one of Sunset's stealth aids at the Summer Sun Celebration is a ''Background Pony'' spell, which makes her and her surroundings appear utterly uninteresting to any observers.
14th Feb '16 10:48:28 PM BrokenEye
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* ''Literature/TheIlluminatusTrilogy'' gives us an interesting example in the form of the nonsense word "fnord", which is this trope to itself due to society as a whole being conditioned from an early age to immediately forget it after they've read it. However, forgetting it provokes an uneasy feeling in the reader, causing them to attribute this apparently sourceless discomfort to the actual content of whatever message the word was written in. TheIlluminati ([[MindScrew or whoever they really are]]) strategically pepper certain documents with the word in order to force a negative reaction and dissuade people from investigating any further into what they've read.
** "Seeing the fnords", breaking ones mental conditioning and gaining the ability to consciously notice the word, is portrayed as something akin to the conspiracy theory version of enlightenment.

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* ''Literature/TheIlluminatusTrilogy'' gives us an interesting example in the form of the nonsense word "fnord", which is this trope to itself due to society as a whole being conditioned from an early age to immediately forget it after they've read it. However, forgetting it provokes an uneasy feeling in the reader, causing them to attribute this apparently sourceless discomfort to the actual content of whatever message the word was written in. TheIlluminati ([[MindScrew or whoever they really are]]) strategically pepper certain documents with the word in order to force a negative reaction and dissuade people from investigating any further into what they've read.
** "Seeing the fnords", breaking ones mental conditioning and gaining the ability to consciously notice the word, is portrayed as something akin to the conspiracy theory version of enlightenment. [[PostModernism This being the sort]] [[MindScrew of novel that it is]], "seeing the fnords" is mentioned more than a few times ''long'' before it's actually explained what fnords are.
14th Feb '16 6:28:52 PM BrokenEye
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* ''Literature/TheIlluminatusTrilogy'' gives us an interesting example in the form of the nonsense word "fnord", which is this trope to itself due to society as a whole being conditioned from an early age to immediately forget it after they've read it. However, forgetting it provokes an uneasy feeling in the reader, causing them to attribute this apparently sourceless discomfort to the actual content of whatever message the word was written in. The Illuminati strategically pepper certain documents with the word in order to force a negative reaction and dissuade people from looking any further. "Seeing the fnords", breaking ones mental conditioning and gaining the ability to consciously notice the word, is portrayed as something akin to the conspiracy theory version of enlightenment.

to:

* ''Literature/TheIlluminatusTrilogy'' gives us an interesting example in the form of the nonsense word "fnord", which is this trope to itself due to society as a whole being conditioned from an early age to immediately forget it after they've read it. However, forgetting it provokes an uneasy feeling in the reader, causing them to attribute this apparently sourceless discomfort to the actual content of whatever message the word was written in. The Illuminati TheIlluminati ([[MindScrew or whoever they really are]]) strategically pepper certain documents with the word in order to force a negative reaction and dissuade people from looking investigating any further. further into what they've read.
**
"Seeing the fnords", breaking ones mental conditioning and gaining the ability to consciously notice the word, is portrayed as something akin to the conspiracy theory version of enlightenment.
14th Feb '16 6:27:01 PM BrokenEye
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Added DiffLines:

* ''Literature/TheIlluminatusTrilogy'' gives us an interesting example in the form of the nonsense word "fnord", which is this trope to itself due to society as a whole being conditioned from an early age to immediately forget it after they've read it. However, forgetting it provokes an uneasy feeling in the reader, causing them to attribute this apparently sourceless discomfort to the actual content of whatever message the word was written in. The Illuminati strategically pepper certain documents with the word in order to force a negative reaction and dissuade people from looking any further. "Seeing the fnords", breaking ones mental conditioning and gaining the ability to consciously notice the word, is portrayed as something akin to the conspiracy theory version of enlightenment.
8th Feb '16 6:23:42 PM PaulA
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* In ''Film/BramStokersDracula'', Gary Oldman is having his way with Lucy and as Mina comes down, he murmurs, "No. Do not see me." And she doesn't.

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* In ''Film/BramStokersDracula'', Gary Oldman Dracula is having his way with Lucy and as Mina comes down, he murmurs, "No. Do not see me." And she doesn't.
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