High Quality Content by WIKIPEDIA articles! City of Illusions is a 1967 post-apocalyptic science fiction novel by Ursula K. Le Guin, set on Earth in the distant future in her Hainish Cycle. City of Illusions is significant because it lays the foundation for the Hainish cycle, a fictional world in which the majority of Ursula K. Le Guin`s Science Fiction novels take place.