The Sixty-Four Changes

Stack a broken line (yin) or a solid line (yang) six high, and there are exactly sixty-four figures — the whole range of change, a binary cosmos. Leibniz saw his binary arithmetic in the arrangement in 1703 and was amazed.

The deepest rhyme on the bench: a world spelled from two marks combined, as the Sefer Yetzirah spells one from twenty-two letters and 231 gates.