I Ching was a Chinese form of divination from Will's world and was used by Mary Malone. It was one of the ways in which Dust and Shadows communicated with humans. Malone had a book on I Ching and used it while she was in the mulefa world and the World of Cittàgazze.[1] There were I Ching sticks in the Dark Matter Research Unit, but they were only used as a decoration and the Cave was used instead to talk to Dust.[2]



  1. The Amber Spyglass, Chapter 7
  2. The Subtle Knife, Chapter 4
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