Explore the 5,000-year-old Hetu (河圖) and Luoshu (洛書) diagrams — the foundational cosmological maps that determine how Wood, Fire, Earth, Metal, and Water elements are assigned to every number in Korean Saju.
Korean Saju number analysis rests on two ancient cosmological diagrams: the Hetu (河圖) and the Luoshu (洛書). These diagrams, dating back more than 5,000 years to the mythological foundations of Chinese civilization, are not mere decorative symbols. They encode a complete philosophical system linking numbers, directions, seasons, and the Five Elements (Wood, Fire, Earth, Metal, Water) into a unified cosmic framework. Understanding these diagrams is essential to understanding why specific numbers carry specific elemental energies.
According to Chinese legend, the Hetu diagram was revealed on the back of a dragon-horse (龍馬) emerging from the Yellow River. The pattern showed dots arranged in a specific configuration: odd numbers (representing Heaven, yang energy) on the outside, and even numbers (representing Earth, yin energy) on the inside. The five pairs this creates — 1&6, 2&7, 3&8, 4&9, 5&10 — each correspond to one of the Five Elements. This is where the fundamental rule of Saju numerology originates: ones digits 1 and 6 belong to Water, 2 and 7 to Fire, 3 and 8 to Wood, 4 and 9 to Metal, and 0 and 5 to Earth.
The Luoshu diagram, equally ancient, was said to appear on the back of a sacred tortoise emerging from the Luo River during the reign of Emperor Shun. Its configuration forms what mathematicians now recognize as a 3×3 magic square — a grid where every row, column, and diagonal sums to 15. The numbers 1 through 9 are arranged so that 5 occupies the center, 1 is in the north (Water), 9 in the south (Fire), 3 in the east (Wood), and 7 in the west (Metal). This spatial arrangement reinforces the directional and elemental associations of the numbers established in the Hetu.
Published: 2026-02-24
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