THE I CHING TRIGRAMS 
The Pre-Heaven Eight Trigrams were supposedly developed by the Emperor Fu Hsi around the year of 2900 B.C. Legend has it that Fu Hsi received his inspiration as a gift from a flying dragon that came out of the Yellow River. Fu Hsi may or may not have been the original developer of the Pre-Heaven Pa-Kua. Legend further has it that he taught the people of the early Yellow river civilization how to cook and live in harmony with nature.
The eight trigrams philosophy grew out of an initial divinatory form attributed to Fu Xi, the legendary ruler, in 2852 B.C. it was changed and amended by King Wen. This set of trigrams formed the basis for the Yi Jing, or Book of Changes. Originally a manual of oracles, the Book of Changes evolved to consider ethical matters, and eventually became a book of wisdom, one of the Five Classics of Confucianism. It became a common source for both Confucian and Taoist philosophy. The central theme of the book, as well as the central theme of Baguazhang, is continuous change. While the basic idea of the Book of Changes is the continuous change and transformation underlying all existence, the martial art style of Baguazhang absorbs this idea into a system of exercise and defense. At first the Book of Changes was a collection of linear signs to be used as oracles. In its most rudimentary sense these oracles confined themselves to the answers "yes" and "no". A "yes" was written in a single unbroken line (--), and represented Yang (of the Yin-Yang). Solid lines also symbolized the dragon, which has always been recognized by the Chinese as symbol of vigilance, strength, the virtues of Heaven and the minister of the will of the gods. A "no" was written in a single broken line (--), and also represented Yin. Over time, a need arose for differentiation and amplification of the philosophy, and additional lines were included. Thus the Eight Trigrams were developed. A Trigram is a set of three broken or unbroken lines. Later, the Eight Hexagrams evolved. A Hexagram is a set of six broken or unbroken lines. The Eight Trigrams is the origin of Baguazhang philosophy.
TrigramsQian symbolizes heaven, creativity, and originality of all things. Of the Eight Trigrams it is the one to indicate change, variation or substitution of things to achieve harmony. As indicated by the strong and undivided lines, it means good fortune, strength, roundness, and vitality.
Kun represents the earth and femininity. Expressing originality and firmness, it is complementary to Qian and contains all things which through its power achieve full development. Numerically it is represented by three broken lines which symbolize an accentuation of the Yin qualities and subordination.
Zhen Thunder, symbolizes the movement and development of things. Indicated by two broken lines and one solid line, it foretells apprehension and changes.
Kan Water, expresses danger. Another meaning is "water flowing" which signifies the thinking and concentration of the mind. The solid line in the center symbolizes the strength of inner thought - it also predicts the perilous danger that might be encountered or the mental abnormality that might be suffered.
Ken Mountain, signifies that action or motion is prevented or halted. It is represented by a solid line with two broken lines below. Since it represents a mountain, Ken symbolizes the stoppage of travelers and the resting of both mind and body.
Sun Wind, is a symbol of growth, and denotes the sun as well as the wind and wood. It reflects the qualities of pliability and influence. It is represented by two solid lines and a broken line. Sometimes it is used to signify the growth of vegetation.
Li Fire, denotes firmness and beauty. Represented by a solid line at the top and the bottom with a broken line in-between, it has a double meaning of both tenacity and adherence.
Dui River, signifies happiness, satisfaction, achievement, and progression. Represented by a broken line and two solid lines, its weakness is compensated by the double portion of power and strength.