The I Ching or Yijing is an ancient Chinese oracular book whose texts have their origin in shamanic divination practices of the Shang dynasty (ca. 1600-1046 B.C.). These texts are organized in terms of sixty-four hexagrams, graphs consisting of six whole or broken lines, corresponding respectively to yang and yin. Therefore the book is a bridge between two different perspectives on reality, the intuitive and imaginal approach of shamanic trance and the structured and rational approach of yin-yang philosophy. For the ancient Chinese the Yijing was a map of "heaven and earth", i.e. of the totality of existence. As in many other forms of divination, the consultation relies on a random procedure, which points to a very different mental attitude towards what we call "chance". Jung has called this attitude "synchronicity", a topic examined in depth in his correspondence with Wolfgang Pauli. After a brief discussion of the concept of synchronicity based on the above correspondence, the article traces the history of the Yijing from its origins to its present diffusion in the West, paying special attention to the studies realized at Eranos, in which the author has been personally involved
Keywords: I Ching, Yijing, divinazione, sincronicità, Jung, Pauli, Eranos