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''Excession'', first published in 1996, is Scottish writer Iain M. Banks's fourth science fiction novel to feature the Culture, a fictional interstellar society. It concerns the response of the Culture and other interstellar societies to an unprecedented alien artifact, the Excession of the title. The book is largely about the response of the Culture's Minds (AIs with enormous intellectual and physical capabilities and distinctive personalities) to the Excession itself and the way in which another society, the Affront, whose systematic brutality horrifies the Culture, tries to use the Excession to increase its power. As in Banks' other Culture novels the main themes are the moral dilemmas which confront a hyperpower and how biological characters find ways to give their lives meaning in a post-scarcity society which is presided over by benign super-intelligent machines. The book features a large collection of Culture ship names, some of which give subtle clues about the roles these ships' Minds play in the story. In terms of style, the book is also notable for the way in which many important conversations between Minds resemble email messages complete with headers. ==Plot summary== The Excession of the title is a perfect black-body sphere that appears mysteriously on the edge of Culture space, appears to be older than the Universe itself and resists the attempts of the Culture and technologically equivalent societies (notably the Zetetic Elench) to probe it. The Excession is what the Culture's social scientists describe as an ''Outside Context Problem'', one which a society cannot foresee and is often fatal. A metaphor to help explain this phrase is that of a successful aboriginal culture suddenly finding ocean-going vessels on its shores for the first time. A group of stereotypical bureaucrat Minds tries to manage the Culture's response to the Excession but are brushed aside by the Interesting Times Gang, an informal elite group of Minds (some of whom are veterans of the Idiran-Culture War), who try to deal with what is by far the most serious challenge the Culture has faced. Meanwhile a rapidly expanding race, which the Culture calls ''the Affront'' (because of its systematic sadism towards subject species and its own females and junior males, despite being relatively advanced), tries to exploit the Excession by infiltrating a store of mothballed Culture warships and using them to claim control of the mysterious object. It turns out that the Affront have been manipulated into their grab for power by another Culture faction which thought it was morally imperative to curb the Affront's cruelty by any means, and intend to use the Affront's theft of Culture warships as an excuse for war. The GSV ''Sleeper Service'' eventually takes control of the situation. Its name is the most meaningful pun in the story: outwardly it is an Eccentric (drop-out from the Culture) which dedicates its enormous resources to presenting tableaux of historical events (mainly battles) populated by passengers in suspended animation; but in fact it is a sleeping member of Special Circumstances (SC), the Culture's covert operations organisation. The name of ''Sleeper Service'' is thus double-pronged—it is a ''Sleeper'' Service to human beings in Storage, and a Sleeper ''Service'' within SC, as it has produced a massive war-fleet during the 40-year period it has spent behaving as an Eccentric. It prepares to deploy this fleet during transit to the Excession. But ''Sleeper Service'' has an unresolved issue. Until a few decades previously, the ship operated under another name as a normal GSV, providing a habitat for a vast number of Culture citizens. Two of its passengers, Dajeil and Genar-Hofoen, had had an intense love-affair and, after a series of sex changes, had each become impregnated by the other until Genar-Hofoen was unfaithful and Dajeil attacked Genar-Hofoen, killing the unborn child. After the break-up, Dajeil froze her pregnancy and withdrew from society for 40 years while the ship changed its name to ''Sleeper Service'' and started acting as an Eccentric. It carried only one conscious humanoid passenger, Dajeil, for which it considered itself partly responsible. As a result, when the Culture asks ''Sleeper Service'' to help in dealing with the Excession, the ship demands that in return Genar-Hofoen must be handed over to it. Genar-Hofoen is lured to ''Sleeper Service'' on a pretext, and only later told that he is there to work with Dajeil to help her recover from her psychological trauma. ''Sleeper Service'' then unloads the passengers who had been part of its historical tableaux. Having converted a large percentage of its internal structure into engines, it easily outruns the very fast ship which other elements of the Culture had asked to keep watch on it. Once it is beyond the watching ship's sensor range, ''Sleeper Service'' changes course and heads towards the Excession. When it arrives, it deploys in the region of 80,000 remote-controlled warships. The Excession unleashes a vast energy weapon which threatens to obliterate the ''Sleeper Service'' and its entire fleet. In desperation, the ''Sleeper Service'' transmits a complete copy of its personality, its "Mindstate", to the Excession, which immediately calls off the attack. The Minds controlling the ships which the Affront stole from the "mothball" find themselves outnumbered more than 130:1 and refuse to fight. The Affront fleet commander orders his subordinates to surrender, then commits suicide; meanwhile the "Sleeper Service" identifies the conspirators and broadcasts details throughout the galaxy. A prolonged war between the Culture and the Affront is thus averted. At the same time the Excession disappears as mysteriously as it arrived. Meanwhile, the rush of events, combined with a conversation with Genar-Hofoen, results in Dajeil deciding to complete her pregnancy. Genar-Hofoen returns to the Affront, having been rewarded by being physically transformed into a member of the Affront species (whose company he finds more stimulating than that of the Culture's people). The book's epilogue reveals that the Excession is a sentient entity which is currently acting as a bridge for a procession of even higher beings which travel between universes. It also assesses whether the species and societies it encounters are suitable to be enlightened about some unknown further existence beyond the Universe. As a result of events in the story the Excession concludes that the civilisations it has encountered in our universe are not ready for this enlightenment and hides itself so that it will not cause any further disturbance, hence its disappearance at the end of the book. It also takes the name given to it by the Culture – ''Excession'' – as its own. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Excession」の詳細全文を読む スポンサード リンク
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