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Taoists long ago (before the modern scientific discoveries of electromagnetism, electric energy power and quantum field mechanics) recognized subtle invisible forces in their subjective personal experience. They classified these forces in nature and the universe in terms of their category of effects in humans (physical, energetic, mental or spiritual qualities). Since they experienced the effects of the invisible forces and energies in the practices and found tremendous benefit for completing their inner alchemy, they called it the Supreme Natural Force, Original Force or Primordial Force. When they accessed it to apply it in the processes of inner alchemy they also referred to it as Primordial Chi. This use of terminology is analogous to the usage in modern life to  electromagnetic force' and electric energy when the force is activated and used in some application the term  'energy' is used to identify its effects in action, like chi is used by Taoists. Sometimes 'force' and 'chi' are commonly used loosely and interchangeably.