In his book Cosmic Communist Constructions Photographed , Frédéric Chaubin documents 90 buildings in 14 former-USSR republics belonging to what he calls the 'fourth age' of Soviet architecture.They reveal an unexpected rebirth of imagination, a burgeoning that took place from 1970 until 1990 and in which, contrary to the 20s and 30s, no 'school' or main trend emerges.These buildings represent a chaotic impulse brought about by a decaying system. Their diversity announces the end of the Soviet Union