That art part he talks about is the "discretionary" aspect of using TA. Simply, discretionary traders use TA differently than those trying to use TA in a quantifiable/scientific way.
..People don't even realize that trading started at birth of man, give a rock for piece of meat, not much different trading money for ribs, People should take what they know and use it in the markets, no one goes out shopping saying I want to overpay for tomatoes, but women often do most of the shopping so naturally men are worst at trading. Ironic.
