Caelum est Conterrens: I frankly don't see how this is a horror story

by chaosmage 1 min read6th Mar 201347 comments

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So Eliezer said in his March 1st HPMOR progress report:

I recommend the recursive fanfic “Friendship is Optimal: Caelum est Conterrens” (Heaven Is Terrifying).  This is the first and only effective horror novel I have ever read, since unlike Lovecraft, it contains things I actually find scary.

So I read that and it was certainly very much worth reading - thanks for the recommendation! Obviously, the following contains spoilers.

I'm confused about how the story is supposed to be "terrifying". I rarely find any fiction scary, but I suspect that this is about something else: I didn't think Failed Utopia #4-2 was "failed" either and in Three Worlds Collide, I thought the choice of the "Normal" ending made a lot more sense than choosing the "True" ending. The Optimalverse seems to me a fantastically fortunate universe, pretty much the best universe mammals could ever hope to end up in, and I honestly don't see how it is a horror novel, at all.

So, apparently there's something I'm not getting. Something that makes an individual's hard-to-define "free choice" more valuable than her much-easier-to-define happiness. Something like a paranoid schizophrenic's right not to be treated,

So I'd like the dumb version please. What's terrifying about the Optimalverse?