I just don't know how anybody can fly fish (nymph) without an indicator! Well I suppose you can, but gee you would need to maintain a great contact with the fly, not always an easy thing to do.

I include using a "dry" as an indicator also.

I use anything from a dry fly, a very small piece of coloured yarn or up to those enormous and ugly clip on things that seem to be the go in some big New Zealand waters.