The symbol seems to be in motion, something explained in Yin and Yang's nature as cyclical, opposite forces that transform into each other. It is not possible for Yin to exist without Yang, and vice versa. This concept can be illustrated by the example of day turning into night, and the night transforming back to day.
Variations In Yan Yang Symbols
Chinese people attribute the qualities of perfection and ultimate purity with this symbol. The nature of the lotus, which rises from mud without getting tainted, gets reflected in the Yin Yang Lotus symbol.
The 'oracle bones', turtle carapaces and animal shoulder blades meant for divination in ancient China, have inscriptions of the earliest forms of the symbol.