Our sense of harmony is strongly shared—if the piano is out of tune, everybody leaves the bar; but we also, as individuals, have broadly disparate preferences. Two warring notions, both valid. Lots of people just don’t get it about wine. Any kid who has sneaked a taste will tell you that wine is hot, sour, bitter, and harsh. If you are reading this book, though, you somehow got past that. You had a peak experience that turned you into an oenophile.