By the Eyes of the Blind: Difference between revisions

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'''Bombo''': Hi, Elena!

'''Elena''': Huh? Bombo, I... I can see you! The Bobaks, Bursties, Snyakutz Bu, I can see all of you!|''[[Monster Allergy]]'', ''The Devourer''}}

A creature, or [[Invisible Aliens|entire race of creatures]], can only be seen by individuals who possess a certain trait. For anyone who does not share that trait, the creature cannot be perceived at all. Usually, losing the trait will also cause you to lose the ability to perceive them, though in some cases, once you have encountered the creature, you will always be able to perceive them.

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For the literal version of this trope, see [[Blind Seer]].

== Anime and Manga ==

* Shinigami in ''[[Death Note]]'' can only be seen by people who have touched a Death Note belonging to that particular shinigami.

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== [[Real Life]] ==

* Olfactory example: There was a study about how asparagus imparts a particular smell to urine, yet some people report that it doesn't work on them. The punchline of that study was that some people simply cannot ''detect'' that particular smell - they have a "dead spot" to that odor. Interestingly, [[Dirty Jobs|Mike Rowe]] found that he couldn't detect certain smells (and others registered strangely) when shooting the odor analysis segment (season 3, ep. 14).<br /><br />Sadly there are more serious consequences to this than simply being unable to tell if someone's had asparagus. There are poisonous gases which some people can't smell and so can't detect as leaking when they enter a room, which may have debilitating or fatal results.

* Olfactory example: There was a study about how asparagus imparts a particular smell to urine, yet some people report that it doesn't work on them. The punchline of that study was that some people simply cannot ''detect'' that particular smell - they have a "dead spot" to that odor. Interestingly, [[Dirty Jobs|Mike Rowe]] found that he couldn't detect certain smells (and others registered strangely) when shooting the odor analysis segment (season 3, ep. 14).

:Sadly there are more serious consequences to this than simply being unable to tell if someone's had asparagus. There are poisonous gases which some people can't smell and so can't detect as leaking when they enter a room, which may have debilitating or fatal results.

* Certain high-frequency sounds - between about 15 kHz and about 20 kHz - can be heard by children and adolescents, but generally not by anyone older than 25. Sounds in this range have been put to use both as [[Teens Are Monsters|teenager repellent]] (because by nature it's an extremely irritating high-pitched whine) and as an [[Invisible to Adults|Inaudible To Adults]] mobile phone ringtone. As time passes, a person's hearing gets damaged and therefore lose some of their range. Those who take care of their hearing (protect them from loud noises, mostly) and/or have sharp ears to begin with will usually keep their ability to ~~listen to~~ these sounds. Conversely, some can never hear into this range, by a simple quirk of genetics.

* Certain high-frequency sounds -- between about 15 kHz and about 20 kHz -- can be heard by children and adolescents, but generally not by anyone older than 25. Sounds in this range have been put to use both as [[Teens Are Monsters|teenager repellent]] (because by nature it's an extremely irritating high-pitched whine) and as an [[Invisible to Adults|Inaudible To Adults]] mobile phone ringtone. As time passes, a person's hearing gets damaged and therefore lose some of their range. Those who take care of their hearing (protect them from loud noises, mostly) and/or have sharp ears to begin with will usually keep their ability to perceive these sounds. Conversely, some can never hear into this range, by a simple quirk of genetics.

** Those inaudible mobile phone ringtones have one (occasionally hilarious flaw): the adult in question (generally a teacher) may not be able to hear it, but when everyone in the class is clutching their ears in pain and yelling at the person whose phone is ringing...

* Certain bitter chemicals, such as phenylthiocarbamide (PTC) can only be tasted by people with the right flavor-receptors in their taste buds. People with the greatest variety of receptors and/or a denser supply of them are known as "supertasters", and tend to dislike flavors with bitter components, such as coffee or cabbage.

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[[Category:Eye Tropes]]

[[Category:By the Eyes of the Blind]]

[[Category:Pages with comment tags]]