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** In [[Recap/DoctorWhoS29E12TheSoundOfDrums "The Sound of Drums"]], the Doctor extends the effect to the TARDIS keys he and his companions carry, allowing them to avoid detection after Mr Saxon has them declared public enemies.

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** In [[Recap/DoctorWhoS29E12TheSoundOfDrums "The Sound of Drums"]], the Doctor extends the effect to the TARDIS keys he and his companions carry, allowing them to avoid detection after Mr Saxon the Master has them declared public enemies.

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The TropeNamer is ''Series/DoctorWho'', specifically a piece of circuitry that the Ninth Doctor explains to companions Rose and Jack that a Perception Filter helps the TARDIS blend in, no matter what form it takes, even it's iconic anachronistic police box form. It ''shifts'' perception of the person looking at the TARDIS to make you not look at it unless you actively try to.


* In ''WebAnimation/{{RWBY}}'', this is [[spoiler: Lie Ren]]'s Semblance, with a catch: it shuts down or at least severely subdues the emotions of the person it affects, which is why it works only on [[TheHeartless the Grimm]] who identify living beings through their emotions. Against humans and [[LittleBitBeastly faunus]] though, it doesn't work.

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* In ''WebAnimation/{{RWBY}}'', ''WebAnimation/{{RWBY}}'' has two known users of a [[PersonalityPowers semblance]] that falls under this is [[spoiler: trope:
**
Lie Ren]]'s Semblance, with a catch: it shuts down or at least severely subdues Ren's semblance masks the negative emotions of the person it affects, which is why it works only on making them virtually invisible against [[TheHeartless the Grimm]] who identify living beings through their emotions. Against humans and [[LittleBitBeastly faunus]] though, it doesn't work.work.
** Emerald Sustrai's semblance can make anyone hallucinate by altering the sensory information the target's brain processes. While she's fine using it against individual targets, making multiple targets hallucinate seems to drain her much faster, with two people causing a headache, and an entire group of about ten causing her to faint from mental exhaustion.


[[folder:Web Comics]]

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[[folder:Web Comics]][[folder:Webcomics]]


* In ''Literature/AncillaryJustice'' the Garseddai guns have an effect like this, though in an unusual variation it affects cameras but ''not'' biological eyes.

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* Creator/DavidEddings:
**
In ''Literature/AncillaryJustice'' the Garseddai guns have an effect like this, ''[[Literature/TheElenium Sparhawk]]'' series of books, there are several different approaches to invisibility. The one most frequently seen, used by the Child-Goddess Aphrael (also known as 'The Nimble Goddess' or 'That damn sneaky thief that you just can't hate even though in an unusual variation it affects cameras she just robbed you blind 'cuz her smile is so cute'), is basically this - she magically diverts people's attention, so they sorta' know you're there, but ''not'' biological eyes.they don't pay attention to you. They'll even step out of the way to let you past, without noticing that they're doing it.
** The same is used briefly in the ''Literature/{{Belgariad}}'', to make Garion's giant sword a bit less conspicuous. In the ''Malloreon'', one is applied to a book of prophecy to keep unauthorized people from reading a certain passage. All the passages are clearly written and intact in every copy of the prophecies, simply written on an area of parchment the size of one letter.
** The young boy and insanely clever budding thief Gher in ''Literature/TheRedemptionOfAlthalus'', who can "dodge" telepathic powers such as those from one of the companions, Leitha. As he describes it, he can tell where a telepath is aiming his or her mental "ears" and just "steps out of the way".
----



* ''Literature/TheCircleOpens'': The first book of the quartet, ''Magic Steps'', introduces "unmagic". Among other things, it can be used to make people invisible and unnoticeable even though the cloaked individuals are committing murders right in front of an observer. This is exactly how the villains are using it, by the way. The major downside to unmagic, however, is that it also has a nasty habit of consuming people it touches.

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* ''Literature/{{Circleverse}}'', ''Literature/TheCircleOpens'': The first book of the quartet, ''Magic Steps'', introduces "unmagic". Among other things, it can be used to make people invisible and unnoticeable even though the cloaked individuals are committing murders right in front of an observer. This is exactly how the villains are using it, by the way. The major downside to unmagic, however, is that it also has a nasty habit of consuming people it touches.touches.
%%* Daniel Suarez's ''Literature/{{Daemon}}'': ''[=FreedomTM=]'' uses a technological version that only works on digital cameras (see: Ring of Aggys.)



** This actually turns out to be a problem when he ''wants'' to get an InnocentBystander's attention to warn them about the rampaging werewolf, but the potion's effects make it so that the bystander hears his yelling as meaningless smalltalk.
* Creator/DavidEddings:
** In the ''[[Literature/TheElenium Sparhawk]]'' series of books, there are several different approaches to invisibility. The one most frequently seen, used by the Child-Goddess Aphrael (also known as 'The Nimble Goddess' or 'That damn sneaky thief that you just can't hate even though she just robbed you blind 'cuz her smile is so cute'), is basically this - she magically diverts people's attention, so they sorta' know you're there, but they don't pay attention to you. They'll even step out of the way to let you past, without noticing that they're doing it.
** The same is used briefly in the ''Literature/{{Belgariad}}'', to make Garion's giant sword a bit less conspicuous. In the ''Malloreon'', one is applied to a book of prophecy to keep unauthorized people from reading a certain passage. All the passages are clearly written and intact in every copy of the prophecies, simply written on an area of parchment the size of one letter.
** The young boy and insanely clever budding thief, Gher in ''Literature/TheRedemptionOfAlthalus'' who can "dodge" telepathic powers such as those from one of the companions, Leitha. As he describes it, he can tell where a telepath is aiming his or her mental "ears" and just "steps out of the way".

to:

** This actually turns out to be a problem when he ''wants'' to get an InnocentBystander's attention to warn them about the rampaging werewolf, but the potion's effects make it so that the bystander hears his yelling as meaningless smalltalk.
* Creator/DavidEddings:
** In the ''[[Literature/TheElenium Sparhawk]]'' series of books, there are several different approaches to invisibility. The one most frequently seen, used by the Child-Goddess Aphrael (also known as 'The Nimble Goddess' or 'That damn sneaky thief that you just can't hate even though she just robbed you blind 'cuz her smile is so cute'), is basically this - she magically diverts people's attention, so they sorta' know you're there, but they don't pay attention to you. They'll even step out of the way to let you past, without noticing that they're doing it.
** The same is used briefly in the ''Literature/{{Belgariad}}'', to make Garion's giant sword a bit less conspicuous. In the ''Malloreon'', one is applied to a book of prophecy to keep unauthorized people from reading a certain passage. All the passages are clearly written and intact in every copy of the prophecies, simply written on an area of parchment the size of one letter.
** The young boy and insanely clever budding thief, Gher in ''Literature/TheRedemptionOfAlthalus'' who can "dodge" telepathic powers such as those from one of the companions, Leitha. As he describes it, he can tell where a telepath is aiming his or her mental "ears" and just "steps out of the way".
small talk.



** "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.

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** "Seeing the fnords", breaking ones one's 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.are.
* ''Literature/ImperialRadch'': In ''Literature/AncillaryJustice'' the Garseddai guns have an effect like this, though in an unusual variation it affects cameras but ''not'' biological eyes.



* Two examples in ''Literature/TheLostFleet'' series. Geary's team figures out the Enigma aliens don't have cloaked ships but have remotely hacked the humans' computers so their sensors ignore them. The idea is later taken up [[spoiler: by the people who create the AI Black Fleet]], who are rendered "invisible" to Alliance sensors thanks to a software update distributed to their ships. Geary points out the stupidity: the update only effects Alliance naval ships. Everyone else can see perfectly well who is attacking them.



* ''Literature/TheRavenTower'': One god-spoken piece of snakeskin prevents people from noticing the person who holds it. {{Discussed|Trope}} when a character realizes that this is both more effective (since it affects all the senses) and more efficient (since it's just clouding mortal minds rather than precisely manipulating light) than true {{Invisibility}}.



* Daniel Suarez's [[Literature/{{Daemon}} FreedomTM]] uses a technological version that only works on digital cameras (see: Ring of Aggys.)



* William Gibson's ''Literature/ZeroHistory'' also does the technological variant (see: Ugly T-Shirt)
* Two examples in ''Literature/TheLostFleet'' series. Geary's team figures out the Enigma aliens don't have cloaked ships but have remotely hacked the humans' computers so their sensors ignore them. The idea is later taken up [[spoiler: by the people who create the AI Black Fleet]], who are rendered "invisible" to Alliance sensors thanks to a software update distributed to their ships. Geary points out the stupidity: the update only effects Alliance naval ships. Everyone else can see perfectly well who is attacking them.
* ''Literature/TheRavenTower'': One god-spoken piece of snakeskin prevents people from noticing the person who holds it. {{Discussed|Trope}} when a character realizes that this is both more effective (since it affects all the senses) and more efficient (since it's just clouding mortal minds rather than precisely manipulating light) than true {{Invisibility}}.

to:

* %%* William Gibson's ''Literature/ZeroHistory'' also does the technological variant (see: Ugly T-Shirt)
* Two examples in ''Literature/TheLostFleet'' series. Geary's team figures out the Enigma aliens don't have cloaked ships but have remotely hacked the humans' computers so their sensors ignore them. The idea is later taken up [[spoiler: by the people who create the AI Black Fleet]], who are rendered "invisible" to Alliance sensors thanks to a software update distributed to their ships. Geary points out the stupidity: the update only effects Alliance naval ships. Everyone else can see perfectly well who is attacking them.
* ''Literature/TheRavenTower'': One god-spoken piece of snakeskin prevents people from noticing the person who holds it. {{Discussed|Trope}} when a character realizes that this is both more effective (since it affects all the senses) and more efficient (since it's just clouding mortal minds rather than precisely manipulating light) than true {{Invisibility}}.
T-Shirt)



** Used to [[PlayedForDrama terrifying effect]] with the Silents, whom you forget you encountered as soon as you are no longer looking at them. They were originally created as religious confessors, so people could confess their sins and then forget having done that, only feeling unburdened.

to:

** Used to [[PlayedForDrama terrifying effect]] with the Silents, Silence, whom you forget you encountered as soon as you are no longer looking at them. They were originally created as religious confessors, so people could confess their sins and then forget having done that, only feeling unburdened.

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* ''Literature/TheRavenTower'': One god-spoken piece of snakeskin prevents people from noticing the person who holds it. {{Discussed|Trope}} when a character realizes that this is both more effective (since it affects all the senses) and more efficient (since it's just clouding mortal minds rather than precisely manipulating light) than true {{Invisibility}}.


** Used to [[PlayedForDrama terrifying effect]] with the Silence, who you forget you encountered as soon as you are no longer looking at them. They were originally created as religious confessors, so people could confess their sins and then forget having done that, only feeling unburdened.

to:

** Used to [[PlayedForDrama terrifying effect]] with the Silence, who Silents, whom you forget you encountered as soon as you are no longer looking at them. They were originally created as religious confessors, so people could confess their sins and then forget having done that, only feeling unburdened.


* Anyone employed by the titular ''Webcomic/AwfulHospital'' is unable to hear, see, or comprehend almost anything involving [[spoiler:[[OmniscientCouncilOfVagueness The Parliament of the Old Flesh.]]]]

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* Anyone employed by the titular ''Webcomic/AwfulHospital'' is unable to hear, see, or comprehend almost anything involving [[spoiler:[[OmniscientCouncilOfVagueness The Parliament of the Old Flesh.]]]]Flesh]]]]. One character describes what they did as messing with the Hospital's ability to prioritize important information.

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* ''Videogame/ResidentEvilRevelations2'' has Glasps, horrible wasp-like men who are only visible upon death or if you throw a smoke grenade (or if you have the psychic girl Natalia with you, she can see their aura). Based on how the screen gets wavy and distorted the closer they approach (and how Barry knocks himself in the head as if he's getting dizzy) it seems the Glasps are not truly invisible so much as emitting a chemical that blurs your vision and gives you a mental blind spot where they are.


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--although it's possible for the ''images they create'' to still prevent people from seeing them properly.

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 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--although it's possible for the ''images they create'' to still prevent people from seeing them properly.
properly. It also tends to fail if the user draws too much attention to themselves, so the HighlyVisibleNinja and ScreamingWarrior will find it useless.

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* Two examples in ''Literature/TheLostFleet'' series. Geary's team figures out the Enigma aliens don't have cloaked ships but have remotely hacked the humans' computers so their sensors ignore them. The idea is later taken up [[spoiler: by the people who create the AI Black Fleet]], who are rendered "invisible" to Alliance sensors thanks to a software update distributed to their ships. Geary points out the stupidity: the update only effects Alliance naval ships. Everyone else can see perfectly well who is attacking them.


* Anyone employed by the titular ''Webcomic/AwfulHospital'' is unable to hear, see, or comprehend almost anything involving [[spoiler:[[OmnicientCouncilOfVagueness The Parliament of the Old Flesh.]]]]

to:

* Anyone employed by the titular ''Webcomic/AwfulHospital'' is unable to hear, see, or comprehend almost anything involving [[spoiler:[[OmnicientCouncilOfVagueness [[spoiler:[[OmniscientCouncilOfVagueness The Parliament of the Old Flesh.]]]]

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** The Foundation has a class of drugs called "[[http://www.scp-wiki.net/updated-amnestics-guide mnestics]]" which provides protection against some Perception Filters.

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* In ''Fanfic/AshesOfThePast'', for some reason, there's one applied to [[spoiler: the entirety of Team Galactic; they can operate in plain sight and no-one will see, hear or even notice anything odd is going on. Only Ash and those he has Reminded of the old timeline are immune to the effect, but considering all the new Pokémon he has, that still only amounts to around half of his team, and a scant handful of his new Legendaries.]]

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** [[Recap/DoctorWhoS37E3Rosa "Rosa"]]: The antagonist hides the suitcase containing his gear in an empty warehouse this way. The Doctor finds it by tracking the artron energy it gives off due to having travelled through time.

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