Here is a rather unusual streamer from Preston Jennings. It puts into practice some of his theories regarding the way trout see underwater. He thought that the water would break up images into their component colors, as a prism breaks up light into individual sections of the spectrum. This theory was just one component of his scientific approach and treatment of all things fly fishing. He stated: The proper coloring of the lure is determined by viewing the object which it is desired to simulate through a prism and coloring the lure in exactly the same manner as it appears through the prism.