These two motions are reciprocally transformed, the one into the other.
Thus one notes that the earth, by turning, makes animals and men have coitus, and (because the result is as much the cause as that which provokes it) that animals and men make the earth turn by having coitus.
It is the mechanical combination or transformation of these movements that the alchemists sought as the philosopher's stone."
Georges Bataille The Solar Anus (1931)