A descending sequence creates a concentration funnel: from nine's broad humanism through seven's deep wisdom to four's practicality. Root 2 transforms this movement into a collaboration tool — the ability to find common ground with anyone.
History
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Chinese numerology
Descending melody: from imperial 九 (jiǔ) 'eternity' through contemplative 七 (qī) to dangerous 四 (sì) 'death'. Paradox: the deeper the dive, the clearer understanding of life cycles. Number for those unafraid of truth.