Since, as we have repeatedly shown, there is just as little transcendental use of pure concepts of understanding as there is of concepts of reason, because the absolute totality of series of conditions in the world of sense is based solely on a transcendental use of reason that demands this un conditioned completeness from what it presupposes is a thing in itself; and since the world of sense, however, contains nothing like that com pleteness, there can never again be an issue about the absolute magni tude of the series in this world, whether it might be bounded or in itself unbounded, but only about how far we should go back in the empirical regress when we trace experience back to its conditions, so that, fol lowing the rule of reason, we do not stop with any answer to its questions except that which is appropriate to the object.