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This is a tough one, even for Lem fans. Stick with it though, the long, dense build up in the beginning pays off.
Like many of Lem's other works, this book documents the complete lack of cultural reference points, and thus any basis for communication whatsoever, between human and alien intelligence. In this case, repeated mis-communication leads to the worst of all possible outcomes. A fiasco indeed.
The book contains some very interesting musings concerning human conceptions of alien life and the attempt to map out the possibilities along which an alien civilization might evolve. Lem compellingly explores the limits to which the human mind can understand something completely different than itself or the environment that shaped it. Highly recommended.