IMAGE. ReadingOne. Semiotics.

While reading the pdf, I had kind of a break through while reading this quick little article. I understand what icon is, that is a very straight forward idea. An icon is something that looks like what it is trying to represent, but it isn't that object. It is just pencil on paper, or just light on a wall. Index is something correlates directly back to the object. A footprint on the ground correlates to a shoe/foot. Smoke correlates directly back to a fire. A symbol, however, is something that functions through agreed rules(taken directly from the reading). That one little phrase made symbol click in my head. However, now figuring out which ones are through agreed rules is the struggle.