We can go further, and can say: “The world of phenomena we certainly have around us, but all that we believe we have in these phenomena is what we have ourselves added to them, what we have thought into them. Our own sense-impressions are all we can rightly accept. Anyone who says this—mark it well!—is not an adherent of Phenomenalism. He peels off from the phenomena everything which he thinks comes only from the understanding and the reason, and he allows validity only to sense-impressions, regarding them as some kind of message from reality. This outlook may be called Sensationalism.
A critic of this outlook can then say: “You may reflect as much as you like on what the senses tell us and bring forward ever so ingenious reasons for your view—and ingenious reasons can be given—I take my stand on the point that nothing real exists except that which manifests itself through sense-impressions; this I accept as something material.‿ This is rather like an atomist saying: “I hold that only atoms exist, and that however small they are, they have the attributes which we recognize in the physical world‿--anyone who says this is a materialist. Thus, by another path, we arrive back at Materialism.