These relate to how energy or "chi" flows through nature. It is also concept of how these elements relate. Each element can give strength or weakness to another element.
The elements are: Metal
Trigrams of the I-Ching
Legend says that Sage and Emperor Fu Hsi discovered the Eight Trigrams (pa kua) on the shell of a tortoise. It is believed that he then created the Book of Changes (I Ching). A trigram is composed of three individual lines.
The I Ching is made up of 64 Hexagrams with solid and broken lines. Each line has the properties of either Yin (broken lines) or Yang (solid lines) - each line having the properties of either Yin or Yang. The characteristics of each trigram will determine its meaning, character and associations.