What is a hexagram and where does it come from?
A hexagram is the basic unit of the I Ching, formed by six lines (爻) stacked from bottom to top. Each line is either a solid line (yang, 陽) or a broken line (yin, 陰). The six lines combine into 64 hexagrams, each with its own name and meaning, reflecting a specific situation in the process of change of the universe and human life.
According to legend, hexagrams were formed in ancient times, through stages from the Eight Trigrams (eight single trigrams) created by Fu Xi, to their doubling into 64 hexagrams by King Wen, and later explained by the Duke of Zhou and Confucius. However, these are traditional accounts, not verified by modern science.
What is the structure of a hexagram?
Each hexagram consists of two parts: a single trigram (three lines) above and a single trigram below, also called the upper trigram and lower trigram. For example, the hexagram Shui Tian Xu consists of the upper trigram Kan (Water) and the lower trigram Qian (Heaven). This combination creates the name and meaning of the hexagram. In addition, each hexagram has lines with their own positions and properties, used for more detailed interpretation.
How are hexagrams used?
In the I Ching, hexagrams are used to describe and analyze situations, from which lessons for behavior are drawn. People may cast a hexagram to select one corresponding to a moment, or study the meaning of each hexagram to apply it to life, work, and career. Articles on the site have examined many hexagrams such as Shui Tian Xu (hexagram 5), Tian Shui Song (hexagram 6), Shan Di Bo (hexagram 23), Shan Shui Meng (hexagram 4), Di Shui Shi (hexagram 7), Shui Lei Zhun (hexagram 3), Lei Di Yu (hexagram 16), Shan Tian Da Chu, etc. Each hexagram is analyzed for its origin, structure, and application lessons.
Distinguishing hexagram from easily confused concepts
A hexagram differs from a line: a line is a smaller unit, just a yin or yang stroke; a hexagram is a set of six lines. A hexagram also differs from the Eight Trigrams: the Eight Trigrams are eight single trigrams (three lines), while hexagrams in the I Ching usually refer to the 64 doubled hexagrams (six lines). Additionally, a hexagram is not identical to "image" (象) or "text" (辭) in the I Ching; the image is a symbolic representation, the text is the explanation.
Note on application
The I Ching and its hexagrams are traditional knowledge for reference, not scientifically verified. Using hexagrams to predict the future or make important decisions should be considered carefully, not taken as absolute truth.