It is way more fun to think that there is a magic involved. Only a real killjoy would think that personal adaptations and adjustments calibrated with exacting standards which developed over a period of years of objective analysis would be at the heart of it. But then looking at the pics of the first four, I notice that there are slight variations in the fadeouts. Then there is the comment stated that no two bows will shoot exactly alike, by John, which is correct. That leaves it up to the complex category of art, an immeasurable quantity of innovation, inspiration, craftsmanship, and luck.