Let us revert to our example of the use of “lighter” and
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“darker” for coloured objects and the vowels. A reason which we should like to give for saying that here we have two different uses and not one is this: “We don't think that the words ‘darker’, ‘lighter’ actually fit the relation between the vowels, we only feel a resemblance between the relation of the sounds and the darker and lighter colours.” Now if you wish to see what sort of feeling this is, try to imagine that without previous introduction you asked someone, “Say the vowels a, e, i, o, u, in the order of their darkness.” If I did this, I should certainly say it in a different tone from that in which I should say, “Arrange these books in the order of their darkness”, that is, I should say it haltingly in a tone similar to that of, “I wonder if you understand me”, perhaps smiling slyly as I say it. And this, if anything, describes my feeling.