NINETEENTH-CENTURY CERMAN AESTHETICS A word becomes a concept insofar as it simultaneously has to fit countless more or less similar cases which means, purely and simply, cases which are never ecual and thus altogether unequal. Just as it is certain that one leaf is never totally the same as another, so it is certain that the concept leaf, is formed by arbitrarily discarding these individual differences and by forgetting the distinguishing This awakens the idea that, in aspects. addition to the leaves, there exists in nature the leaf the original model according to which all the leaves were perhaps sketched, curled, and woven, measured, coloured, painted-but by incompetent hands, so that no specimen has tumed out to be a correct, trustworthy, and faithful likeness of the original model.