Stanislaw Lem's Fictitious Criticism of Nonexisting Books - Imaginary Magnitude

In 1973 Lem published a book Imaginary Magnitude (Wielkość Urojona), a collection of introductions to books supposedly to be written in the future, in the 21st century. One of those Lem eventually developed into a book by itself: Golem XIV is a lengthy essay on the nature of intelligence, delivered by the eponymous US military computer. In 1985 it was published in English by Harvest Books under the title Imaginary Magnitude.

Imaginary Magnitude differed from the previous book, A Perfect Vacuum, by a more serious tone, and probably therefore did not enjoy the same kind of enthusiasm from the readers.