Yin and Yang This is a universal concept of contrasting qualities and it should not be modified. There is a common mistake in classifying yin and yang. Some people think that mountain is strong while water is weak and thus mountain is yang and water is yin. This is not true. In Feng Shui, we emphasize on motion and stillness.
Mountain is stationary while water is moving.
What is stationary is yin while what is moving is yang. Here I refer to King Wen's Hou Tian Ba Gua that is used in Feng Shui. It is a word for word translation. This is the center of controversy around the Southern Hemisphere issue if we consider the Ba Gua merely as an energy map. Since the study of Feng Shui originated in China, a lot of the principles are referred to the geographical aspects in central China.