When you're talking about flies, we typically break them down into attractors (Micky fins, intruders so on) and the more species specific patterns or imitators (Magog smelt, muddler minnow so on) but within the imitators, there are those that are more suggestive like the hares ear or zug bug and those that more closely represent the actual insect like a Kaufman stone. The hares ear has been around for a long time and when it was originated, tyers were limited to natural materials as much of what we use today to more closely mimic the natural insect were simply not available so many of the early patterns were very simple and suggestive. As previously stated, the hares ear doesn't represent one thing in nature but can represent many things from may fly nymph, caddis larva, scuds and shrimp.