The era after the Tang dynasty and before the Song dynasty is called the Five Dynasties and Ten Kingdoms period.
It started with the fall of the Tang dynasty in 907AD and ended with the founding of the Song dynasty in 960AD.
Feng shui is all about rivers, mountains and earth energies that radiate and offer people an opportunity to live harmoniously with nature. The constant wars gave off yin energies that diluted or offset the right kind of energies therefore bad feng shui resulted.
The Han dynasty offered the right kind of feng shui setting with thick and concentrated energy.
After the Han, constant movements under the earth angered the dragon that stirred instability and caused chaotic changes in thrones and empires.
The constant movement of the Earth's plates affected the Himalayas and Kunlun Mountains.
Such movements shifted to southeast regions, affecting the rivers, ponds and lakes of China.
With the constant killings in wars and movements of such unstable energies, there was disgruntlement among the citizenry, and rebellions were the result.
Life spans were also low during this period.
Sea levels rose an estimated 195 millimeters from 1870 to 2004 another threat that changes the feng shui landscape. Rises in sea levels may also influence populations in coastal and island regions.
The climatic changes that caused these are the culprits, and are detrimental to feng shui settings.
All feng shui practitioners should know by now that changes to the magnetic field, together with continuously rising sea levels, affect the accuracy of feng shui readings. So it's not the tool that is the problem. It's our own Earth constantly changing its features that leads to inaccurate readings.
Kerby Kuek has published 15 books on feng shui, inner alchemy, Taoism and metaphysics. He can be contacted at www.kerbykuek.com