u'"The designer\u2019s task will be to build a \u201cblack box\u201d which performs the necessary regulation. But neither the designer nor anyone else will know how this \u201cblack box\u201d is performing it. He will not know the mathematical function representing the correlation between \u201cinputs\u201d and \u201coutputs.\u201d The reason he will not know it is not because it will be impossible to find out but, first of all, because it will not be necessary."

"Black Box" from "Summa Technologiae"'