Consider Phlebas and Look to Windward make a great matched pair. The first introduces the Culture and a bunch of crackling ideas around the beautiful fantasy of

Consider Phlebas and Look to Windward make a great matched pair. The first introduces the Culture and a bunch of crackling ideas around the beautiful fantasy of a post-scarcity, post-mortality, post-stupidity civilization. It's 31 years old but still feels fresher than most new SF, because the author embraces the weird, wild possibilities of his fictional technology instead of nerfing/overlooking them for the sake of audience familiarity. Look to Windward is a great follow-up, emphasizing that you can have the smartest, best-intentioned, most powerful military ever and still fuck up when you try to use it to fix another civilization. The rage of the survivors of the Culture's intervention is quite justifiable, though the means of attempted retaliation isn't. From my brief description you might think that it was an allegory dashed off in response to the occupation of Afghanistan or Iraq, but the book was published in 2000. Banks was ahead of the curve.