The need for abstraction comes from a simple fact that no single human mind can hold the whole endlessly complex picture of anything. Therefore, at some level we all have to cut off.
Whatever is hidden below, will be all thrown together and represented as a set of simple interfaces at that lowest possible level which we still can access (colored dots, lines and planes, mnemonic set of rules, or whatever else you prefer). How these interfaces are really implemented, and what lurks deep within, we often have no idea, and in most cases, don’t even want to know for fear of losing the “whole picture”.
As a consequence, because our internal representation still remains incomplete, we will sooner or later tamper with those unseen dark whirls, folds and clouds too much. Then they raise above our cut-off level and bring the unpredictable chaos along.
And this will be the system talking to us.