Ascending ladder of fortune: 二 (èr) — pair, 四 (sì) — danger, 六 (liù) — smooth flow, 八 (bā) — wealth. Despite unlucky 4, ending with 8 promises overcoming difficulties and prosperity. 发财 (fācái) — get rich!
History
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Western numerology
Four stages of growth: from partnership (2) through structure (4) to care (6) and material success (8). This sequence shows the path from first collaborative steps to building an empire. Each digit forms the foundation for the next.