THE SIGN:

Trigram Chên, the Arousingabove Chên the Arousing, Thunder
Trigram Chên, the Arousingbelow Chên the Arousing, Thunder

The hexagram Chên represents the eldest son, who seizes rule with energy and power. A yang line develops below two yin lines and presses upward forcibly. This movement is so violent that it arouses terror. It is symbolized by thunder, which bursts forth from the earth and by its shock causes fear and trembling.