It can be said that, fundamentally, literature is intended to narrate, and therefore preserve, what has happened. Without it, there would be no history, and there would be no culture. At some point, however, it was realized that it could do more, that it could also narrate what did not happen, but could have happened or could happen. It may be impossible to say when this discovery dates from. Since then, however, this has been the basis of great literature: the factual or the plausible, or both at the same time. What stands out is that no matter how much time passes, literature cannot stray from this guiding principle. The writer, therefore, must necessarily keep reality in mind while writing; otherwise, he will not be able to produce a work of value. Give the imagination full freedom, use allegories, do whatever he wants, but his work will always, always be confronted with reality.