This Symbol (Yin-Yang) represents the ancient Chinese understanding of how things work. The outer circle represents "everything", while the black and white shapes within the circle represent the interaction of two energies,called "yin" (black) and "yang" (white), which cause everything to happen. They are not completely black or white, just as things in life are not completely black or white, and they cannot exist without each other.
With my Yin Yang, I wanted to represent the two energies as Humanity and Mother Nature. How both need one another for its survival and existence. Both nature and humanity go hand in hand.