In Chinese philosophy, yin and yang (also yin–yang or yin yang, 陰陽 yīnyáng “dark–bright”) describe how seemingly opposite or contrary forces may actually be complementary, interconnected, and interdependent in the natural world, and how they may give rise to each other as they interrelate to one another. Last night I dreamed that someone added color to this symbol and represented it as a spinning disk (in a publication from the Nature publishing group).  The specifics of the dream helped me…