Hellmut Wilhem, in Heaven, Earth and Man in the Book of Changes The Yijing's oldest components, although substantially undocumented, are believed to have been compiled prior to the eleventh century BCE, its early development difficult to examine, due to the absence of extant linguistic and historical certainties. Another one is Fu Jou, the drawing of mystical pictures, and the writing or recital of mystical invocations for the purpose of invoking a response from the subtle realm of the universe..." ...which is apparently what I was practicing. The use of colored pencils proved to be an effective tool, in allowing rapid reworking of ideas, and creating a wide, yet coordinated pallet of colors. ...they established the Way of Heaven: Dark and Light; they established the Way of Earth: Pliability and Rigidity; they established the Way of Man: Love and Duty. For this reason in the Book of Changes six lines comprise a hexagram, and in it dark and light are divided, and pliability and rigidity alternate. ...in the Book of Changes, six positions make up an entire unit.