The bagua or pakua (八卦) are a set of eight symbols that originated in China, used in Taoist cosmology to represent the fundamental principles of reality, seen as a range of eight interrelated concepts. Each consists of three lines, each line either "broken" or "unbroken", respectively representing yin or yang. Due to their tripartite structure, they are often referred to as Eight Trigrams in English. The trigrams are related to Taiji philosophy, Taijiquan and the Wuxing, or "five elements". The relationships between the trigrams are represented in two arrangements: the Primordial (), "Earlier Heaven", or "Fu Xi" bagua () and the Manifested (), "Later Heaven", or "King Wen" bagua. The trigrams have correspondences in astronomy, astrology, geography, geomancy, anatomy, the family, martial arts, Chinese medicine and elsewhere. The ancient Chinese classic, I Ching (Pinyin: Yi Jing), consists of the 64 pairwise permutations of trigrams, referred to as "hexagrams", along with commentary on each one. Trigrams There are eight possible combinations to render the various trigrams ( bāguà): Relation to other principles Book of Changes listed two sources for the eight trigrams. The chapter explains the first source thus: This explanation would later be modified to: Another chapter, , characterizes the trigram, which represents Heaven, and , which represent earth, as father and mother, respectively, of the six other trigrams, who are their three sons (, , ) and three daughters (, , ). The trigrams are related to the five elements of Wu Xing, used by Feng Shui practitioners and in Traditional Chinese Medicine. Those five elements are Water, Wood, Fire, Earth and Metal. The Water (Kan) and Fire (Li) trigrams correspond directly with the Water and Fire elements. The element of Earth corresponds with both the trigrams of Earth (Kun) and Mountain (Gen). The element of Wood corresponds with the trigrams of Wind (Xun) (as a gentle but inexorable force that can erode and penetrate stone) and Thunder (Zhen). The element of Metal corresponds with the trigrams of Heaven (Qian) and Lake (Dui). Hexagram lookup table Fu Xi's "Earlier Heaven" King Wen's "Later Heaven" Bagua used in Feng Shui The Bagua is an essential tool in the majority of Feng Shui schools. The Bagua used in Feng shui can appear in two different versions: the Earlier Heaven Bagua, used for burial sites, and the Later Heaven Bagua, used for the residences. Primordial Bagua In Primordial Bagua, also known as