A giant tortoise appeared in the Lo, the main river of China. Inscribed on the back
of this tortoise was a miraculous square. Scholars of that time studied this square.
Thus Feng Shui, I Ching, Chinese Numerology and Astrology were born. The hard back
of this tortoise was divided into 9 squares. Numbers were etched on each square.
Addition of these numbers horizontally, vertically or diagonally produced 15. This
is how Lo Shu originated in China 4000 year back.
Later on this tortoise was regarded as Lord of North.
Middle square of this diagram has brown color and indicates Earth element. No. 9
in red depicts Fire. In bottom middle 1 in blue is water, 3 in green is Wood, 7
in Yellow indicates Metal.
Later on, Feng Shui experts connected the directions and seasons with this square.
In Chinese Vastu South is always shown at top of Diagram.
This miraculous square also indicated 8 arms that symbolize various aspects of human
life. Later on this square became the figure of octagonal Pakua or Bagua.
The miraculous square found on the back of tortoise has been the starting point
of development of Pakua or Bagua. All 9 squares that make miraculous square of 3x3
are related to various aspects of life.