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By the Eyes of the Blind: Difference between revisions
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== Literature ==
* Thestrals in ''[[Harry Potter (novel)|Harry Potter]]'' can only be seen by those who have witnessed someone die. Harry joins this group in the fifth book after he comes to terms with being there at Cedric's murder. It comes as a bit of a shock when he arrives at Hogwarts and sees that the "horseless" carriages are actually pulled by skeletal, reptile-faced, winged horses.
** The [[Public Domain Artifact#The Hand of Glory|Hand of Glory]] introduced in ''[[Harry Potter and the Chamber of Secrets (novel)|Chamber of Secrets]]'' is a specialised example: its ''light'' can only be seen by the person holding it.
* [[Discworld]]
** Death can be seen by animals, witches and wizards, and small children. And people about to die or who are having a near-death experience. In brief, anybody whose [[Weirdness Censor]] is off. ...And Carrot, who used him as a witness for a murder in the short story 'Theatre of Cruelty'. The book ''[[Wyrd Sisters]]'' states that Death can also be seen if people truly expect to see him (which may explain Carrot's ability to use him as a witness). In ''Wyrd Sisters'', Death walks on stage during a play at a time when the audience expects an actor playing Death to show up—and is seen by everyone in the audience. And gets stage fright.
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* 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.
* Colorblind people can be useful in aerial recon. Some types of camouflage don't work on them.
* A lot of non-military camouflage looks a uniform pale grey in near-infrared. This is mostly a result of modern dyes being tuned for the visible spectrum, but has the side-effect that, for example, a game hunter's camo suit stands out as a solid block when viewed through a cheap near-IR camera. This side-effect is sometimes viewed as a safety feature: an injured person wearing camouflage is easy to spot if the rescue party uses an infrared camera (and near-IR cameras are a
** Some popular [[Virtual Reality]] headsets use near-infrared cameras to locate themselves in space, and for "passthrough" (where the wearer sees through the cameras). Add an infrared torch, and the wearer can see where (s)he's going in what, for everyone else, is complete darkness.
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