the visible world could have been formed.[487] We can explain this by supposing that as the stream of Matter departs more and more from the One, its power of self-reflection continually diminishes, and at length ceases altogether. It is thus that the substratum of sensible objects must, as we have seen, be conceived under the aspect of a passive recipient for the forms imposed on it by the Soul; and just as those forms are a mere image of the noetic Ideas, so also, Plotinus tells us, is their Matter an image of the intelligible Matter which exists in the Nous itself; only the image realises the conception of a material principle more completely than the archetype, because of its more negative and indeterminate nature, a diminution of good being equivalent to an increase of evil.[488] Still Plotinus gives no clear answer to the question whence comes this last and lowest Matter. He will not say that it is an emanation from the Soul, nor yet will he say that it is a formless residue of the element out of which she was shaped by a return to the Nous. In truth, he could not make up his mind as to whether the Matter of sensible objects was created at all. He oscillates between unwillingness to admit that absolute evil can come from good, and unwillingness to admit that the two are co-ordinate principles of existence. And, as usual, where ideas fail him, he helps himself out of the difficulty with metaphors. The Soul must advance, and in order to advance she must make a place for herself, and that there may be a place there must be body. Or, again, while remaining fixed in herself, she sends out a great light, and by the light she sees that there is darkness beyond its extreme verge, and moulds its formless substance into shape.[489]