256 reviews for:

Permutation City

Greg Egan

3.97 AVERAGE


The "hypothesis" is pretty engaging but at every point I felt something was missing. Like a key detail that was just explained in hurried dialogue. Too many questions around the basic premise.
SpoilerThe observer needed for an ever expanding universe didn't make sense in the dust theory, Autoverse 'somehow' changing the rules of the TVC universe was not explained in any detail, and that was a crucial part to the ending
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I wouldn't call it hard sci-fi though, just more philosophical as it raises some very interesting questions around second-life type things. It's a good read but not satisfying.
challenging informative reflective slow-paced
Strong character development: No
Loveable characters: No

The ideas are mesmerising, cool, weird. They were the reason I had trouble letting the book go. Be warned, though - the plot and the characters are not much more then vehicles for author's visions. Once you accept that this is a book of ideas, you will have a wild sci-fi ride.

Lots to chew on.

My only criticism of this book, I guess, is that there may be simply too many ideas, woven and assembled into a bewilderingly complex structure.

Or, perhaps: Greg Egan is clearly fantastically smart, and maybe I just don't have the intellectual horsepower to keep up with him.

Just some of the things going on in Permutation City.


  • the multiverse from quantum physics and the idea that at every moment, countless universes branch off

  • the simulation argument: the philosophical argument that it is overwhelmingly likely we are living in a computer simulation

  • the hard problem of consciousness, transferring human consciousness/identity to some kind of computer

  • computability, cellular automata, simulations, and the Ship of Theseus



Normal mere mortal authors would be satisfied writing a great science fiction story with just one of those, but Egan takes all of them, and more, masterfully crafts them into a spectacularly complex literary structure, and then -- to badly mix my metaphors, because I'm not bright enough to express myself otherwise -- has you drink from the firehose.

Recommended if you're up for a brain-burner that, upon finishing, leaves you wandering around going whoa.... as you work on figuring it all out...
challenging inspiring reflective medium-paced

An excellent hard science fiction novel. Better thought-out than many non-fiction works on the simulation hypothesis.
challenging dark emotional hopeful informative reflective sad medium-paced
Plot or Character Driven: A mix
Strong character development: Yes
Loveable characters: Yes
Diverse cast of characters: Yes
Flaws of characters a main focus: Yes

Easily some of the top sci-fi I've read.
Egan manages to juggle a plethora of inspiring ideas alongside a cast of varied and really compelling characters.
Echoes of Berkeley, Leibniz, Hegel, and Nietzsche in the speculations (my reading) plus Von Neumann and Searle (explicitly stated).
Egan's a really impressive writer. Any worries I had about this being at the level of The Matrix or Rick and Morty or Black Mirror were completely unmitigated. This book lives leagues and leagues above those.
adventurous dark medium-paced
dark mysterious reflective medium-paced
Plot or Character Driven: A mix
Strong character development: No
Loveable characters: No
Diverse cast of characters: No
Flaws of characters a main focus: No