I don't know when fiction was invented, but for untold ages, fiction has been central to humanity. It is at least as old as cave paintings: no one without fiction could have painted them. You must imagine what is not in order to paint them. To plan requires imagination, which is the root of fiction. We don't hunt by instinct, we learn, imagine and plan.
Non-fiction is good, it gives us information. Fiction exercises the imagination. It shows us other possibilities. Some people deride the reading of fiction, but they probably get their fiction from TV.
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