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Kaelen ran a hand through their hair, which felt more like fine optic fibers than protein. For Kaelen, the ancient worries about "men" and "women" felt like worrying about which side of a coin was up when the coin had long since melted into a single sphere.

The reference to appears in various literary and technical contexts, most notably within Stephen Baxter’s science fiction novel Coalescent , where it touches on the evolution of humanity and the blurring lines of sexual identity. Kaelen ran a hand through their hair, which

They checked their personal log. It was the year 3062—exactly a millennium since the "Great Shift" had begun. On their screen, an old digital fragment flickered: a scanned page labeled . It was a relic from the early 21st century, a conversation between two long-dead thinkers speculating on a time when "sexual difference is in the individual, not a case of belonging to one half of the species or the other". They checked their personal log