The title phrase is from Art Wars and various posts in this journal.

"Go ahead," he said; he handed her three Chinese brass coins
 with holes in the center. "I generally use these."

The Man in the High Castle , quoted here on Nov. 14, 2003

Janet Burroway's 'Writing Fiction: A Guide to Narrative Craft,' fifth edition, with I Ching coins on cover

See also Tangled Tale, Yonda Lies the Castle, and a gathering in Dublin today.