structural:expansion, stylistic:tone, linguistic:paraphrasing, information:extraction, quality:correction
I Ching

In the I Ching, originally a divination manual of the Western Zhou period (c. 1000–750 BC) based on Chinese Astronomy, yin and yang are represented by broken and solid lines: yin is broken (⚋) and yang is solid (⚊). These are then combined into trigrams, which are more yang (e.g. ☱) or more yin (e.g. ☵) depending on the number of broken and solid lines (e.g., ☰ is fully yang, while ☷ is fully yin), and trigrams are combined into hexagrams (e.g. ䷕ and ䷟). The relative positions and numbers of yin and yang lines within the trigrams determines the meaning of a trigram, and in hexagrams the upper trigram is considered yang with respect to the lower trigram, yin, which allows for complex depictions of interrelations.