Bionis and Mechonis seem to represent the Taoist idea of Yin and Yang. Yin is masculine and usually presented as white, and Yang is feminine and usually presented as black. Bionis is white and ruled by Zanza (a male) and Mechonis and is black and ruled by Meyneth (a female). Additionally, Mechonis and Bionis are equal in strength and become locked in combat, thus unable to defeat one another. This may parallel the idea that though Yin and Yang are different, they complement one another and, therefore, one cannot live without the other.