It is true that it feels very differently to enjoy a good meal, taking part in an interesting conversation, or to think of how successful your children are. Suppose we do all these things at a particular time. How happy are we at the time? We do not need to calculate the value of each such feelings on any singular scale to answer this question. We need not see our happiness at the time as a mathematical function of these items. It is rather that all these experiences, together with many other factors, causally puts us at the time at a certain level of happiness, i.e. in a certain mood.