Between roughly the 5th century BCE and the 1st century CE, China compiled the Huangdi Neijing (Yellow Emperor's Inner Canon), which describes the body as a balance of yin and yang and the five phases, with qi (vital energy) and blood flowing through channels called jingluo. Around the very same centuries, the Greek physician Hippocrates (c. 460–370 BCE) proposed humorism — that health depended on the balance of four bodily fluids: blood, phlegm, yellow bile, and black bile. Two civilizations with no contact independently reached for the same idea: that the invisible workings of the body were best understood as flow and balance, not as isolated parts. China's Shiji tells of the legendary physician Bian Que, who could see through walls into a patient's organs after drinking a magic potion; Greek myth tells of Asclepius, a healer so skilled he could raise the dead, struck down by Zeus's thunderbolt for defying the natural order.