Ganying, resonance, is the assumption that the cosmos, the state and the human body are structured alike and therefore affect one another. The same five phases — wood, fire, earth, metal, water — the same seasons, directions, colours, organs, flavours and emotions map across all three registers, so that a disturbance in one shows in the others. Politically this meant floods, eclipses and earthquakes were read as evidence of misgovernment, and Han officials used the correlation as a mechanism for criticising emperors who could not otherwise be criticised. Medically it meant that a disorder was a seasonal or directional imbalance rather than an invading entity. Practically it produced an enormous apparatus of correlation — the calendar tells you what to do and avoid on a given day, and almanacs on that basis are still printed and consulted in enormous numbers across the Chinese-speaking world.