Yinyang, Music and Colour' gathers evidence from psychology, musicology, psychoacoustics, archaeology, anthropology, astronomy and the neurosciences to explain three age-old mysteries: the origin of the yinyang symbol, the rare musical capacity of absolute (or perfect) pitch, and the association of music and colour in synaesthesia. The yinyang symbol is shown to have originated as an ancient statistical tool, and helps to solve the other mysteries. The book also examines a fourth enigma: why are these still mysteries when clues for solving them have been available for years.