Lao Tzu Riding An Ox

Laozi - The Founder Of Taoism

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Laozi is also the author of the Daode Jing - the primary scripture of Taoism.

The symbol behind Laozi is called a bagua, which represents various combinations of Yin and Yang.

Link:

 http://taoism.about.com/od/basicprinciples/ig/Faces-of-Taoism/Lao-Tzu-Riding-An-Ox.htm