Fish net  A widely used code in Chinese folk art is fish net. From the primitive society to today, this ever-popular symbol of perpetual life bears a cultural heritage shared by all people on earth. For thousands of years, it has been a sign of auspice and good luck, or Ruyi (wishes being granted) in every way. It is also known as the code of the Eight Diagrams. The transformed patterns and names of this code further enriched the implications it carried. The popular "China Net" being worn as an adornment in tile chest or hung in bedrooms today is from the very code of the fish net. On painted pottery "Human face holding a fish in the mouth" from Yangshao culture, the starting end of the fish net sketch was a" L ' and an "X" "+ ' was the graphic sign of the sun, but"X" was the code for a rotating sun and a revolving earth. The first sign was a square, a donble square or a chequer code; the second sign was a diamond and the net veins; that is the fish net symbol of life.
Over thousands of years, these two symbols and a variety of their extended forms have maintained a lasting popularity in west Asia, China, even around the globe, embedded in all aspects of social life and folk customs in daily food, clothing, shelter and transportation, custom ~ituals and ceremonies; holidays and festivities, beliefs  and taboos. Stone painting from the Hah Tombs in Shandong Province with a lark holding a red book in the  mouth was a fish net symbol same as the one on the  painted pottery from Banpo. "The treasure toad" and "A  snake twining round nine eggs" among the folks in  northern Shaanxi; the "Eight diagrams" and "A toad over a square" from Hebei; "Two snakes twining around nine eggs" (meaning dragon laying nine eggs) on baby's pillow case in Weihe Valley; and the popular "China net" on the market today; are all transformed patterns from the fish net symbol. Even "Yangko', the popular Chinese New Year folk dance loved by the people in northern Shaanxi, is tuned in steps of nine squares and eight diagrams
derived from the fish net symbol.
The same symbol on rock carving from Tuguhun valley in west China's Buerda mountain area is still a popular sign of good fortune often seen on each side of buildings or tents in southern Gansu, Qinghai and part of Tibet where inhabitants are largely Qiang inorities.
After Buddism got into China from India, this symbol became one of the eight symbolic treasures of Buddhist to cherish across China.