Aristophanes states that humans originally had four arms, four legs, and a single head made of two faces.
He continues that there were three genders: man, woman and the "Androgynous".
Zeus developed a creative solution by splitting humans in half as punishment for humanity's pride and doubling the number of humans who would give tribute to the gods.
These split humans were in utter misery to the point where they would not eat and would perish so Apollo had sewn them up and reconstituted their bodies with the navel being the only remnant harkening back to their original form.
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