Woody Colmes and forgotten flies

On Mar 7, 11:18 pm, Kevin Vang wrote:
I have great luck fishing Bi-visibles when the trout are feeding on
caddises. If I had to guess why, I would say that the palmered hackle
resembles a caddis fluttering its wings.

Perhaps--in the dry fly on top of anything but spring creek surfaces--
all
the fish sees is a fuzzy collection of leg-like dimples in
surface film. In other words, on typically broken surfaces, it's
possible
a BiVisible looks roughly the same (to the fish) as an Elk Hair
Caddis.

And if so, why not fish the fly that floats the best, that is
easiest for the fisherman to see.