The chaos that was in the beginning can be compared to an egg. Yin and Yang were formed when the egg split and became male and female forces. The light parts of the egg rose high and became the sky, while the heavier bits fell and became the earth and sea. Pangu the giant also came from the egg and he grew 10 feet every day for 18000 years, until he was the same height as heaven is from the earth, when he died. As his body decomposed, his stomach became the mountains, his eyes became the sun and the moon, his breath became the wind, his tears became rivers, his semen became pearls, his bone marrow became jade, and his bones became metals and stones.