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As a basic boundary, Fantasy depends on what couldn't be. The amount of fantasy can be slight, or it can be grand, but that strangeness element must be there. More importantly, for a work to be rec...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/3319 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
As a basic boundary, Fantasy depends on what couldn't be. The amount of fantasy can be slight, or it can be grand, but that strangeness element must be there. More importantly, for a work to be recognised as fantasy, it will require someone of authority deciding that it is fantasy. Karen Joy Fowler is of sufficient status to be able to declare that her work is science fiction, and that is likely to be good enough. In science fiction and fantasy, there have always been works that sparked debate about whether it is or isn't sci-fi or fantasy. However, unless you're an established author, you don't have the luxury of declaring your work to be fantasy or science fiction like Fowler does; someone else has to do that for you. That means your editor, publisher, your readership, and/or your peers and critics must declare it fantasy to be so. The only way you're going to achieve this is by reading a wide canon of fantasy works to be able to see how it's been done, which helps give a clear picture of what you can get away with, what people recognise as being fantasy. There is, unfortunately, no other way. I'd suggest listening to those editors, critics and readers to see why they don't consider it fantasy. Once you're established, then you can help push those boundaries of what fantasy is.