They say that in ages of ages, Earth gave birth to Moon, her first-born daughter and other self.
The size-ratio of our planet to its moon is anomalous in the solar system. In many ways, the two look more like a binary planet than a planet and moon.
In Moon, it is said, we behold Earth's knowledge of self.
It is believed that the moon accreted from material expelled from what is now the Pacific Ocean, perhaps as the result of impact, some 4.5 billion years ago.
She then gave birth to Sea, it is said: Earth's daughter and other self, born of her longing for Moon, and imprint of her love for self and daughter.