The basic I Ching texts were recorded in China some 3000 years ago. The book contains 64 hexagrams.
Every hexagram has a main text and six connected texts.
A figure, consisting of six lines, is linked with every hexagram. The solid line represents Yang and is associated with the stimulating, active aspect. The broken line represents Yin and is associated with the susceptible, accommodating aspect. Just like the total of six lines is linked to a hexagram, each of the six lines is linked to one of the connected texts. Oracle divination is based on this lines system.