Its lower part, the heaviest element, sinks downwards, and is called Pluto because of its gravity, weight, and great quantity ("plêthos") of matter. After the separation of this heavy element in the middle part of the egg the waters flow together, which they call Poseidon. The purest and noblest element, the fire, is called Zeus, because its nature is glowing (ζέουσα, "zeousa"). It flies right up into the air, and draws up the spirit, now called Metis, that was left in the underlying moisture. And when this spirit has reached the summit of the ether, it is devoured by Zeus, who in his turn begets the intelligence (σύνεσις, "sunesis"), also called Pallas. And by this artistic intelligence the etherial artificer creates the whole world. This world is surrounded by the air, which extends from Zeus, the very hot ether, to the earth; this air is called Hera.