Three things are too wonderful for me; four I do not understand: the way of an eagle in the sky, the way of a serpent on a rock, the way of a ship on the high seas, and the way of a man with a virgin.
Proverbs 30:18-19 ESV

These four things correspond to the four ancient elements: The eagle is air, the serpent is earth, the ship is water, and the man is fire.