Soul's architecture built on descending steps of wisdom. The nine of completion flows to seven of knowledge, then four of foundation and two of union. A philosophical descent from higher truths to earthly bonds.
History
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Chinese numerology
Imperial nine 九 (jiǔ) 'eternity' descends through contemplative seven 七 (qī) to dangerous four 四 (sì) 'death'. Paradox: from highest status to taboo, concluding with diplomacy of root 2.