Diagrams from the I-Ching, (the Book of Changes). On the left is a Luo Shu diagram, on the right is a He Thu diagram. They represented a simple magic square and a cruciform array of the numbers from 1 to 10. Even or Yin numbers are represented in black and odd or Yang ones in white. The Luo Shu is a magic square in which the figures, added up along any diagonal, line or….