The contrast of Black and White (light and darkness, day and night) has a long tradition of metaphorical usage, going back to the ancient near east, and explicitly in the Pythagorean ‘Table of Opposites’.

In western culture in religion and mythology, as well as in confucianism, the contrast symbolizes the moral dichotomy of good and evil. Black and White is a form of visual representation that does not use color.

In chinese philosophy, Yin and Yang describe how seemingly opposite or contrary forces may actually be complementary, interconnected, and interdependent in the natural World, and how they may give rise to each other as they interrelate to one another.

Many tangible dualities such as light and dark, fire and water, expanding and contracting are thought of as physical manifestations of the duality symbolized by Yin and Yang.