Lo Shu Grid

 
Lo Shu Grid

Thousands of years ago in China, the Lo River flooded, inundating the local population. The people were desperate, and frantically made offerings and sacrifices to the river god, asking him to return the water to its banks.

Suddenly a turtle surfaced on the river. The people saw that there was a pattern on its shell, a grid of nine squares. Each square had dots adding up to numbers. No matter which way the dots were added across the rows either diagonally, vertically, or horizontally, the sum was 15. The diagram was called the “Lo Shu,” or "Lo River Writing"