Taijitu during the Qing period for their possible connection with Zhou Dunyi's "taijitu". Ming period author Lai Zhide (1525–1604) simplified the "taijitu" to a design of two interlocking spirals. In the Ming era, the combination of the two interlocking spirals of the "taijitu" with two black-and-white dots superimposed on them became identified with the "He tu" or "Yellow River diagram" (河圖). This version was reported in Western literature of the late 19th century as the "Great Monad", and has been widely popularised in Western popular culture as the "yin-yang symbol" since the 1960s. The contemporary Chinese term for the modern symbol
Yin and Yang (Fish albums) which was also released as a lead single. All new tracks were mixed and produced by James Cassidy, who had previously worked on "Songs from the Mirror" and Suits. The outside cover, a relatively simple concept based on the yin and yang symbol (with each element in the shape of a fish) surrounded by a circular Celtic knot pattern, was again designed by permanent Fish collaborator Mark Wilkinson. The "Yin" version of the cover has a black symbol on a white/greyish background, the "Yang" version has a white symbol against a dark-red/black background. (On the Radio Edits CD cover, the