I am trying to learn how to tie the various baitfish imitations for searun cutthroat in the middle to south puget sound. Maybe someone could answer the following question for me. What is the main objective when tying patterns such as herring, sand lance, etc? Is it to imitate movement? Color? Size? Do they even really "imitate" anything, or do they take advantage of light and movement to trigger the aggressive cutthroat? I ask because I see a lot of patterns with heads that don't look anything like what they are imitating (spherical instead of bullet-shaped - like the shape of the head is built around the stick-on eyes). There are various amounts of epoxy used that effect how much of the material moves (all of it to none of it), and many bodies have profiles that seem way too thin when in the water (lots of synthetics). I know they work, I just wonder why. Can anyone offer a few principles to follow? I don't want to get all bent out of shape over something like the shape of a head if it's not important.