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who has stood at the end of a railroad platform waiting for a friend, will recall what queer people he mistook for him. The shape of a hat, a slightly characteristic gait, evoked the vivid picture in his mind's eye. In sleep a tinkle may sound like the pealing of a great bell; the distant stroke of a hammer like a thunderclap. For our constellations of imagery will vibrate to a stimulus that is perhaps but vaguely similar to some aspect of them. They may, in hallucination, flood the whole consciousness. They may enter very little into perception, though I am inclined to think that such an experience is extremely rare and highly sophisticated, as when we gaze blankly at a familiar word or object, and it gradually ceases to be familiar. Certainly for the most part, the way we see things is a combination of what is there and of what we expected to find. The heavens are not the same to an astronomer as to a pair of lovers; a page of Kant will start a different train of thought in a Kantian and in a radical empiricist; the Tahitian belle is a better looking person to her Tahitian suitor than to the readers of the National Geographic Magazine.

Expertness in any subject is, in fact, a