The Original I Ching
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⚄ · three ways to cast a line

Comparator of casting methods

Coins, yarrow stalks and 16 tokens

Press Cast to simulate 50,000 lines and compare the three methods with their exact distribution.

There are several ways of generating a line, and they do not all give the same. The three coins split the four outcomes symmetrically; the yarrow (49 stalks) does not. And the 16 tokens (a modern simplification) are built to reproduce the yarrow exactly. Here are the three distributions and a simulator that converges to them live. What matters for anyone actually consulting: coins and yarrow are not interchangeable.

Three coins
9 · old yang
2/16
8 · young yin
6/16
7 · young yang
6/16
6 · old yin
2/16

heads = 3, tails = 2; the sum of three coins.

Yarrow (49 stalks)
9 · old yang
3/16
8 · young yin
7/16
7 · young yang
5/16
6 · old yin
1/16

the ancient method; see the experiment on the ritual of the 49 stalks.

16 tokens
9 · old yang
3/16
8 · young yin
7/16
7 · young yang
5/16
6 · old yin
1/16

a modern simplification: 16 tokens in the proportion 3/7/5/1; it reproduces the yarrow by construction.

identical
16 tokens vs yarrow
1/4
P(mutates) = 1/4 in all three methods
coins vs yarrow
Simulator: 50,000 lines per method
Method9 yang▪8 yin7 yang6 yin▪χ² (3 df)
Three coins
Yarrow (49 stalks)
16 tokens

simulated percentage (theory in brackets) · χ² below 16.27 = compatible with the theory at p > 0.001 (3 degrees of freedom)

The practical conclusion: if you consult with coins believing it is equivalent to the yarrow, you are wrong. The two share P(yang) = 1/2 and P(mutates) = 1/4, but they split the direction of the change differently (see coins against yarrow and the Markov chain). The 16 tokens, on the other hand, are an exact substitute for the yarrow: same distribution, verified.