Soul's architecture where solid foundation of four meets double surge of fives toward change. Six adds wisdom of care, while root two reminds: true strength is born from unity of opposites.
History
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Chinese numerology
Tetraphobia of four (四, sì) softened by double fives (五, wǔ) — movers of Wu Xing elements. Six (六, liù) promises smooth flow (流, liú). Twin resonance of fives creates dynamic balance between stagnation and stream.