It’s not about the castanets. Before my trip to Seville, I misunderstood the art form of Flamenco. I had visions of elaborately ruffled women clicking those little plastic gizmos in a face off with brooding matador-types in mock Andalusian ecstasy. It’s not. Flamenco is an art like nothing I’ve ever experienced. It’s raucous, joyous, passionate and great entertainment. Fun fact: castanets were not part of the original flamenco dance but …