@Perry Marshall Sorry, I'm not a coding guy nor computer scientist .... the illustration of "Essential Components of a Communication System" is just too technical for me ..... but coincidentally, I'm on a research of 'natural coding' on plants right now, just in a different perspective
Perhaps an illustration like a flowchart diagram will work better for some of us
This diagram only shows that in the external world the input is equal to the output, while inside the system something happens, encoding and decoding, which is equivalent to doing nothing, because the input is just equal to the output. If you want to be a diagram that clarifies, well, it does not do it at all. Or the solution is already written : doing nothing is the best thing to get the result.