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I do agree that this technique can successfully be used in any genre, but often when the conflict of a story is centered around the characters trying to distinguish what is real it will have the ps...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/4452 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
I do agree that this technique can successfully be used in any genre, but often when the conflict of a story is centered around the characters trying to distinguish what is real it will have the [psychological thriller](http://en.wikipedia.org/wiki/Psychological_thriller) sub-genre associated with it. On the other hand when characters casually acknowledge the existence of multiple realities or [parallel universes](http://en.wikipedia.org/wiki/Psychological_thriller) and aren't troubled by them those stories generally fit broadly into either science fiction or fantasy.