The abstract concepts of Yin and Yang ultimately became linked with concrete divination. In the I-Ching, or The Book of Changes, yang was used to describe the continuous lines and yin the broken lines in a hexagram. Random drawings in sets of six would then be deciphered using the I-Ching as a divinatory manual at the courts. Far from philosophical terms to discuss the process of abstract cycles in human experience, the magical school of the Tao attempted to nail the ideas down to practical, concrete results.