ISBN 1-85798-218-5 (UK pbk)

"Beyond the boundaries of the human mind, and into eternity..." [jacket blurb, UK pbk, 1995]

"Copying human personalities into cyberspace implies a kind of immortality, severely limited by computing capacity. [So] this book's visionary hero takes a further step with his crazy mathematical-philosophical vehicle to a virtual computer space immense enough to contain universes, infinities, heaven and hell. Of course it eventually starts going wrong..." -- (in The Guardian ).

"Probably the most thoroughly worked-out exploration so far of what it might be like to be self-aware software in a software environment... (Wander too far from your programmed 'home', for example, and the world starts to disintegrate as you approach regions of unwritten code.)... Permutation City is filled with wonderful set pieces and vaulting leaps of imagination -- it's a real trip." -- (in Locus ).