Personally I wanted to improve my pattern detection and learn how to spot the key symbol to introduce to another one. Definitely a great result from my point of view. I also was helped to find a metaphor for pattern recognition.
Fish swim in patterns.
You keep casting because unless your fly is on the water you cannot catch a fish and even though you do not know where the fish are you may catch one by chance. While fishing you have to watch the fly all the time because if a fish takes it you have to react in order to catch it. However in your peripheral vision out of the corner of your eye you watch the rest of the water. You notice difference, the ripple that moves against the flow of the others, the v shape that is just the wind on the water, the ring of a fish rising to feed. You put the differences together to make a pattern and forecast where the fish will be and cast there.