Every supposal is an ideal experiment: an experiment done with ideas because you can’t do it any other way. And the function of an experiment is to teach us more about the things we experiment on. When we suppose the world of daily life to be invaded by something other, we are subjecting either our conception of daily life or our conception of that other, or both, to a new test. We put them together to see how they will react. If it succeeds, we shall come to think, and feel, and imagine more accurately, more richly, more attentively, either about the world which is invaded or about that which
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