These are the technicalities. The jetes and pirouettes.. but the music of the dance lies in the subtle signals between the steps: the fish's delivery of them, the fisherman's read of and response to them, which, if she's good, must be near telepathic. That's what takes a death-grip on your concentration. That's why your mind empties of all trivia, which, when playing a fish, includes just about everything else you could possible think of. That is what anglers live for.