The Taiji is understood to be the ideal of existence. Yin and yang are used to illustrate the contrasting qualities within reality and experience. For example, light contrasts with darkness, providing them both with context and therefore meaning. Taiji is not perceived as a simple list of all things and potential things, but rather a complex interconnection of all things in all possible contexts. This concept is often used to illustrate the doctrine of cosmological unity. It is also used to explain the creation of the "myriad things" (i.e., everything in existence) through the dialectical process of alternating polarity between yin and yang. Western proponents of Taoism sometimes conflate Taiji and the "myriad things," but Taiji is not only representative of what exists, but also that which has existed, will exist, and could potentially exist.