Numbers in feng shui: the Luoshu square and the nine stars
Chinese tradition treats numbers as more than counting. In feng shui they are the notation the whole system is written in.
The Chinese tradition has always given numbers a second job. Beyond arithmetic, numbers carry qualities — they stand for elements, directions and fortunes, and changing your numbers is understood as changing your luck. Feng shui inherited this wholesale, and its numerical backbone is a single diagram: the Luoshu.
The Luoshu square
The Luoshu is the three-by-three magic square — the digits one to nine arranged so every row, column and diagonal sums to fifteen. Legend says it appeared on the shell of a turtle emerging from the river Luo. In feng shui each cell is a direction, each number a star with an element and a character:
| Number | Direction | Element |
|---|---|---|
| 1 | North | Water |
| 2 | Southwest | Earth |
| 3 | East | Wood |
| 4 | Southeast | Wood |
| 5 | Centre | Earth |
| 6 | Northwest | Metal |
| 7 | West | Metal |
| 8 | Northeast | Earth |
| 9 | South | Fire |
What the numbers do
Three classical uses keep coming back. Flying Stars calculations move the nine numbers through the square in a fixed path to chart how a building's fortunes shift over twenty-year periods — this is feng shui's version of prediction. Eight Houses analysis uses the numbers to sort people and dwellings into compatible groups. And element gauging reads the balance of metal, wood, water, fire and earth acting on a site through the numbers present in its chart.
Popular number-lore — eight sounding like prosperity in Cantonese, four sounding like death — sits beside this system rather than inside it. The classical machinery is the Luoshu; the phonetic superstitions are folk practice. A serious course teaches the first and mentions the second in passing.