These prophetic dreams were often reported at several removes from the original event and, when not purely fictional, are hard to verify.

Yet 'the 12', as they are known, are not purely fictional.

From the purely fictional to the straight autobiographical.

Purely fictional and oneiric experiences are inseparably interwoven with large sections of real personages or of slightly modified personages and events.

A handful of exceptions, notably faster-than-light interstellar travel and superluminal communication, depend on purely fictional or speculative principles.