The worlds of academia, high fashion, religion, and modern art produce sublime wonders, and sometimes monstrous absurdities. They can afford such creative freedom because their systems of self-regulation and self-perpetuation are insulated from the mundane pragmatics of the outside world. Their autonomy endows them with liberty and creative power. They are free to evolve under their own momentum, along lines of their own choosing, without having to justify themselves at every step to outside critics.
Sexual selection can work similarly. One of sexual selection's central processes allows species to evolve in arbitrary directions under their own momentum. We shall see how this process, Fisher's runaway process, can provide a pretty good first model for how the human mind evolved.
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