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This is a really interesting question, because I think it has a few levels. In SF circles, there's the word 'McGuffin', which essentially means any plot element which is put in place specifically to allow something to happen in the story. There are common McGuffins, like faster than light travel, nanotechnology and so on. But generally, McGuffins are broadly recognised plot devices that are given somewhat of a free pass by devotees of the genre, because they enable something in the plot to happen.
Then there's the broader idea of plot devices which are a fundamental phase of the story, like the Deus Ex Machina that comes along and saves the hero, or the start of a Quest, or a Stranger Comes to Town. We're overlapping with the idea of there only being X number of stories in the world, but I think these are worth looking at.
Ultimately, plot devices are shorthand - they're a way of advancing a story through the use of known cues that people may or may not have seen before. Like any element of written communication, when used clumsily or too often, they jar and make your story seem overly familiar, and not in a good way - yawwwn. But when used in interesting, unfamiliar, creative and original ways, plot devices are just another element in the toolbox. |
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