"...they might begin a philosophical dispute. One of them might argue that they had not got the real cheque-an-sich before them, which was a transcendental cheque and for ever inaccessible, but only the idea or appreance of a cheque, and that ideas did not really exist, or that he did not know what a real cheque was, as the only ultimate reality for him was his own private subjective experience of seeing and touching a cheque and he had no idea wether someone else had the same real experiences or any experience at all. And so on..."

Hutchison, Terence W. (1938): Significance and Basic Postulates of Economic Theory, S.8.