What is the yin-yang?
The yin and yang are the two aspects of everything in the universe. They are not opposing forces, but rather complementing. In the spherical image of the yin-yang (as well depicted above) is made of two parts or "dolphins". In the middle of each dolphin there is an "eye" of the other's color. This shows that no matter how the two are different they fit together to make a whole. The yin-yang has came to be the symbol of many eastern faiths, creeds, and ideologies.

What is yin?
Yin is typically depicted as the darkened dolphin or as a broken line. Yin is the extreme of Earth. Yin is: What is yang?
Yang is typically seen as the lighter dolphin or a complete line. It is the extreme of heaven. Yang is: What are the line symbols?
yin__  __ yang______


______
______   Heaven "ch'ien"
______


______
______   Lake "tui"
__  __


__  __
______   Water "k'an"
__  __


______
__  __   Thunder "Chen"
__  __


__  __
__  __   Earth "K'un"
__  __


__  __
__  __   Mountain "Ken"
______


______
__  __   Fire "Li"
______


__  __
______   Wind "Sun"
______