I always wanted to know what influences the tastes we have? Is it a rational justification or a causal consequence? I know that's two questions but to put it this way: in the end why do I prefer blue shirts more than yellow ones, why do I prefer Salinger more then Stephen King? I can imagine that my tastes are determined by my emotions, my culture, my education or my genetics but that doesn't seem to answer anything since I have the profond impression that I choose, what I like and what I don't, freely and rationaly. More generaly, I believe that the question "What influences the moral values we have?" is an equivalent question.