3000 A.D.

Imagine that someone in 3000 A.D. writes a contemporary novel set in that year but does not publish it then. Instead, he time travels to 2000 A.D. and publishes it in that year as a futuristic sf novel. Readers find that this novel, let's call it 3000 A.D., contains no sf cliches like hyperspace etc: no immortal telepathic robots building galactic empires in faster-than-light spaceships. They also find that much of the text is incomprehensible because it refers to historical or contemporary events that would be familiar to readers in 3000 A.D. but not to readers now, just as we refer to "the war," knowing in context that we mean the Second World War. They expect further elucidation in a prequel or sequel but never receive it. A thousand years later, 3000 A.D. is long out of print and forgotten. Most probably, its publication would make no difference. But, and this finally is the point in a Poul Anderson context, the Time Patrol might investigate.