Yin and Yang in the universe.
The universe consists of attractive and repulsive forces which create vibrations at various levels. Those that vibrate at very low frequencies eventually settle to form matter and those with the frequencies approximately the same as the light remain as energy. Matter and energy in ancient Chinese philosophy refer to Yin and Yang.
Although their characteristics are opposite to each other they are mutually dependent, there will be no Yin without Yang or vice versa. They

