易 YI

”日月为易，象阴阳也“ - 【字圣】许慎

“易”字本身就含阴阳之象（阴阳二字本身就见日月呀）：

日为太阳，在上；月为太阴，在下。（月亮在古时候称“太阴”）

阳为白昼为亮，阴为夜晚为暗。白昼夜晚各占一半，周而复始。

在上为天为轻为往上升，在下为地为重为往下陷。天清轻，地浊重。

阴阳为正(+)负(-)两极， 阴阳相交的行动，孕育着周而复始生命! 核心就一个字：变！

Each characters in Chinese, often carries meaning within itself. For instance this “易” character.

This character is made up of 2 components: The "Sun" character on the top and the "Moon" character below the "Sun" character.

From this character alone, we are able to see how the Yin Yang concepts comes about:

The sun is yang, the moon is yin. This denotes day (bright) and night (dark). Besides equal duration, it also denotes an endless cycle of day and night pattern, not at random.

Yang on top denotes that it is lighter hence rises upwards, where Yin below denotes it is heavier and descend downwards.

Yin and Yang can also be deemed as polarities (Yang as +, Yin as -) . The continuous movement (or energy exchange) between these 2 polarities is what sustain life. The crux of this character is "change". It is no wonder the ancient classic 《易经》is named <The Book of Change>.