Of course there are triggers...we just don't know what they are, hence why we constantly generate new fly patterns in the futile but fun quest for the one magic pattern that works always. Some tire of this game and simplify their patterns to basic generic patterns (refer Bob Wyatt's work for example) but even those souls follow a design philosophy that emphasizes what they think is important. This is as much as part of the sport, as casting, and to me one of the more fascinating and intellectually stimulating aspects of fly fishing and tying. What one must wonder would happen if one were to someday discover the perfect pattern? Despite being the implicit quest of all fishers, it would really make the sport a less satisfying endeavor in my mind.
And of course, "Happy trails, to you..."
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