What ancient book called the Ching is devoted to explaining lines in these symbols?

The ancient book called the I Ching, also known as the Book of Changes, is devoted to explaining the lines and symbols found in the oracle of the same name. The I Ching is a Chinese classic text and one of the oldest books on divination, dating back to the 11th century BCE. It is based on the concept of yin and yang and the belief that the universe is constantly changing and can be understood through the patterns of these changes. The book consists of 64 hexagrams, each made up of six lines that are either solid (yang) or broken (yin). These hexagrams are used for divination and can provide insight into a person's current situation and future prospects.