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What you're trying to do is called foreshadowing. Foreshadowing is essentially providing the groundwork for a later event. The typical rule that is followed is the rule of threes. If something is i...
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Source: https://writers.stackexchange.com/a/27232 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
What you're trying to do is called foreshadowing. Foreshadowing is essentially providing the groundwork for a later event. The typical rule that is followed is the rule of threes. If something is important, mention it at least three times throughout the course of your story. Everyone else is right about techniques for doing this. Working in whatever it happens to be so that it's a natural fixture of the story is generally your aim. If your readers don't pick up on it first read, they'll have the pleasure of doing so on the second read and you'll look brilliant. Often times you'll write many things that need foreshadowing. Revision is a great time to go back and clean those things up so that your events feel earned and satisfying.