Quick answer Why does the book Nhập môn loan đầu say that đắc thủy is supreme? The book Nhập môn loan đầu writes that feng shui takes tàng phong and đắc thủy as complete perfection, in which đắc thủy is supreme, and tàng phong comes next. This ordering shows that the hình thế (landform) school regards water as a more important factor in retaining energy than wind. However, this is the view of one school, not a general rule on which all books agree, and in dương trạch (the feng shui of dwellings) practice one must also consider the direction and the period of the body of water.
From the article “What Is Qi in Feng Shui: Sheng Qi, Si Qi, and the Zangshu Line 'Qi Rides the Wind and Scatters, Is Bounded by Water and Stops'”
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