Black and white represent Yin and Yang, which describes how seemingly opposite or contrary forces may actually be complementary and interdependent in the natural world and how they may give rise to each other as they interrelate to one another. Squares represent Earth in Wu Xing. Red agate, attributing to Fire, aventurine, attributing to Wood and tiger-eye, attributing to Earth, interpret the relationship of mutual generation between Fire and Earth and mutual overcoming between Wood and Earth.
