Han Dynasty often shaped by special classes between heaven and earth to show the body cosmological.Limited to an infinite number of things to express the infinite realm.The collection of the late Han Han Yu Fan Language "Yi" Great and Cheng Jihan generations thought. Gua body Yaoxiang use to map the universe of heaven and earth.To "Gua said change", "Gua said gas", "May said body armor satisfied" and "Yi as saying," and other ideas to show the body of the universe between hexagrams. This article first clarify the basic structure of Yu Fan "Yi" system constructed.,Re-thinking approach to analyzing Yu Fan's induction, Further explore Yu Fan "Yi" to learn of the gas of Thinking.
