According to the Theory of Yin & Yang - it can both represent two opposite things and be used to analyse the two opposite sides inside the same thing. Generally, all active, extrinsic, warm, functional and strong things belong to Yang, while all still, intrinsic, descending, cold, dark, material and weak things belong to Yin. Among human organs, heart, liver, spleen, lung and kidney belong to Yang, while gallbladder, stomach, large intestine, small intestine and bladder belon