A core concept in Buddhism is the emptiness of all things - that all things - emotions, trees, thoughts, the self - are aggregates of other things. The temptation is to ask - aggregates of what? But if we look we will find no essential building block. And so when we look at anger or love, we are looking at something very complex and multifaceted. Often in Zen we hear the word "just". Just be angry. But anger is not a simple feeling. It's a complex mental state with a whole narrative and belief system. How do we practice in the midst of such complexity?