I read both of the Illuminatus trilogy and the Shroedinger's Cat trilogy as a child because they were in the Sci-Fi section and I liked reading Sci-Fi and it never occurred to the adults looking after me that you'd find a shamanistic sex-romp in the Sci-Fi section. Contrary to cliches about kids reading adult books about sex it wasn't so much titilating as disturbing. However, I didn't have much money and I'd spent nearly £10 on that book, I think, so I stuck with it. Took me several attempts to get through it because of all the disturbing stuff about sex machines and such.
As an adult, however, the entire Illuminatus trilogy becomes a male fantasy about being able to have sex without responsibility. Even the two women the main character falls in love with and struggles to decide between
turn out to be two manifestations of the same woman (who is herself a third and further sex fantasy) and therefore are fine him dating both of them.. It's entirely predicated on the idea
fnord that a liberated woman has the same attitude towards sex as men and everything becomes a hyper-sexual open society once the repression has been removed from people. There's not many things I say this about but Illuminatus trilogy could only have been written by a man.
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Now, my own disturbing recommendation:
Blindsight by Peter Watts. The author was good enough to share it for free on his website but don't let lack of cost devalue it, it's the only vampire story in any medium (film, prose, whatever) that I've ever actually found scary. The author is a biologist (marine) by profession and the premise of the vampires is that they were another branch of humanity / hominid now resurrected through genetic science and the novella relates to autism (a KF favourite), epilepsy and language. Please, to anyone who's read it spoiler responses because the surprises in this novella really got to me. It's short but incredibly unsettling. Made a very strong impression on me.
Separately, I'm going to share a really old and obscure SciFi novel called Too, Too Solid Flesh by Nick O'Donohue.
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It's pre-Internet so some of the concepts are hokey but he actually does a very, very good job of projecting forward into the future, imo, with his sort of equivalent to the web that exists within the novel. It's not quite how things turned out but he understood that with increasing knowledge and communications there was going to be
some sort of pooled knowledge/environment come into existence even if he didn't know what it was going to be called. He also nails the way people might misrepresent themselves online and use such tech. The author's not psychic but he's an excellent student of human nature and how tech would be used, as well as the repetitive and unoriginal nature of modern mass media entertainment. For example, he anticipates Deep Fakes and that's part of the premise in that technology can now recreate almost any actor in any role. You want to see Marlon Brando playing MacBeth? Like Indiana Jones movies but have a thing for Kiera Knightly in the main role? Dial it up. Real, modern theatre is dead as is almost any form of local, real entertainment which just can't compete with the glossy, globalised entertainment business. Again, he's writing this back in the early Eighties!
The set-up sounds like a hokey attempt at humour: The characters are android actors in the last live-action theatre troupe in existence, their creator dies and Hamlet (one of the androids) becomes convinced that the death was murder and sets out to uncover the truth / seek retribution. The conceit is that the androids
are their characters - Claudius is conniving, Polonious a ditherer. Was their creator really murdered or is Hamlet just acting his nature? It's shockingly well written, the author seems to actually know his Shakespeare and what sounds like a knock-about parody is played straight and thoughtfully. It's like
Blade Runner met
Rosencrantz and Guildenstern are Dead. You can still find old copies out there and I strongly recommend it to anyone who can handle the retro-futurism of speculative fiction since surpassed by real life.