From the left of this picture above, part one is called, by my/mystic terms: Low Heavenly. Next: High Heaven. Both these two are upright, they are heavenly.
Next: High Earthly (a fancy word is High Telluric). This guy is quick and applies, in a way, hit-and-run.
Next: Low Earthly. This one is strong but heavy, in open terrain he is victim for the afore-mentioned.
High and Low Earth rotates, making it possible for food to grow. Turning the earth by a plow. And earth rotates between night and day. Like the next picture which reminds me of Taijitu.