... his mind all his sensations and ideas, all his perceptions and mental images of things. Now, suppose I close my eyes and picture to myself a barber's pole. Where is the image? We say, in the mind. Is it extended? We feel impelled to answer, No. But it certainly seems to be extended; the white and the red upon it appear undeniably side by side. May I assert that this mental image has no extension ... — An Introduction to Philosophy • George Stuart Fullerton