Well now, I see your point. But to make it stick you have to acknowledge that a particular material of a given fly made it irresistable, all things considered. I don't think any one material does that on any fly. So thats where you lose me. :) I've fished many a day when only ONE particular fly produced fish. Don't have that fly, and you were in for a rough day. Fish are fickle beings some days. That doesn't mean that particular fly had an attribute that was "unfair". It just means that for some reason THAT fly was what they wanted THAT day, and they were not given to let it pass by for one reason or another. I take fish as I find them. If they prove to me that what they want is a "Beadheaded Purple Patunia Gurgler" on a given day, I don't continue to throw Parachute Adams at them just because it is more fitting. I look for the closest thing to that BPPG that I can find, and have a day of it. I don't why....until after I'm done fishing and we are discussing it over a beer. :)