Again and again we realize that, beginning with the superficially visible, the manners of appearing belonging to the unifying multiplicities are themselves unities of multiplicities which lie deeper and which constitute them through appearances, so that we are led back to an obscure horizon which, however, can still be Logical Investigations ); the first attempt at a systematic introduction to the new philosophy of the transcendental reduction appeared in as a fragment (Volume I of Ideas toward a Pure Phenomenology and Phenomenological Philosophy).