The flymph itself fits into my idea of fly fishing, generic and easy. Impressionistic, it exudes the feeling of life with the supple soft hackle collar and buggy body. Generally thought to emulate a hatching insect stuck in the film, or a diving caddis, its generic enough to pretty much just represent foot to trouts.
The fly pattern itself was codified and popularized by two Pennsylvania anglers, James Leisenring and Pete Hidy. Jim himself lived in Allentown and practiced his craft on the banks of the Little Lehigh, the best known of our Lehigh Valley limestone creeks.
Its also not so much a fly tied strictly to recipe as much as a pattern, to be tied to whatever you seek. Materials and methods can be as stringent or vague as you feel.