Taoism southern China and Taiwan may often be identified by their roofs, which feature dragons and phoenixes made from multi-colored ceramic tiles. They also stand for the harmony of yin and yang (with the phoenix representing yin). A related symbol is the flaming pearl, which may be seen on such roofs between two dragons, as well as on the hairpin of a Celestial Master. In general though, Chinese Taoist architecture lacks universal features that distinguish it from other structures. At ancient times, before Daoism Religion was founded, food may be set out as a sacrifice to the spirits of the deceased
School of Naturalists and Qi. In later periods, these epistemological theories came to hold significance in both philosophy and popular belief. This school was absorbed into the alchemic and magical dimensions of Taoism as well as into the Chinese medical framework. The earliest surviving recordings of this are in the Ma Wang Dui texts and Huang Di Nei Jing. Zou Yan (; 305240 BC) was an ancient Chinese philosopher best known as the representative thinker of the Yin and Yang School (or School of Naturalists) during the Hundred Schools of Thought era in Chinese philosophy. Zou Yan was a noted scholar of the