To become a connoisseur—of the arts, ideas, food, wine, languages, movies, sports, economics or history—is ultimately a selfish exercise. You begin because you cannot help yourself; because of an abiding interest, one that will not let you go. Digging deeper becomes self-perpetuating after a while: The more you know, the more you want to know. At some point, you reach a crest and flip over. Once you pass that stage, beautiful things happen. You will hear a snatch of a Bollywood song and be reminded of a symphony. You will make uncommon connections that are ultimately the gift and pleasure of learning something new. A butterfly’s flight will look like an adagio, which refers to slow tempo in music.