fish. It's obvious to us that something is working, but improved skill isn't the easiest to recognize in ourselves so we apply it to the simplest obvious difference... like flies. You watch your newbie friends and they will suddenly find their "go-to" flies right when they're getting really good at fishing.
For me this is the PMX and the SOS
Really, you're just a good fisherman and you'll keep catching more fish than other people.
My dad used to tell me "It's not the arrow. It's the Indian."