Another thing special about Ying and Yang, is one cannot survive without the other. As it is with life. There is no day without night, and there can be no light without darkness. Traditional Yin Yang tattoos are a circle, with two pieces fitting together like puzzles pieces. The two pieces are typically black and white, with a smaller circle of the colors, in opposing pieces.
Positioning of the Ying Yang is dependent on the person getting the tattoo. Some people choose to have the white, or lighter side on top. This is because in scientific terms, the light is energy, or heat, and heat rises. These tattoos are representative of so much spirituality.