In ancient China, there were two mysterious pictures called "LUOSHU"and "HETU", which were considered as the origin of Chinese philosophy. In these two pictures, some short lines, solid circle and hollow circle, as the basic elements, represent the serial complicated principles. 
Some ancient mathematician concluded the graph into other ways: table chart. Then from the tables, people could see the regulation more clearly.
The number of the circle was written in figures in their initial positions, and the solid ones represent even while the hollow ones represent odd numbers. In the first table, the sum of any three numbers in horizontal, vertical and diagonal directions was always 15. In the second table, similar regulation could be found as well.
Apart from the main philosophical system, these two were also exert profound influence to design method from historical period. The Forbidden City was an excellent example of the principle.