abstract:Lo Shu Square (; also written 雒書; literally: Luo (River) Book/Scroll) or the Nine Halls Diagram (), is the unique normal magic square of order three. Lo Shu is part of the legacy of the most ancient Chinese mathematical and divinatory (Yi Jing 易經) traditions, and is an important emblem in Feng Shui (風水), the art of geomancy concerned with the placement of objects in relation to the flow of qi (氣) 'natural energy'.