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16 extends all the way from complete hallucination to the scientists' perfectly self-conscious use of a schematic model, or his decision that for his particular problem accuracy beyond a certain number of decimal places is not important. A work of fiction may have almost any degree of fidelity, and so long as the degree of fidelity can be taken into account, fiction is not misleading. In fact, human culture is very largely the selection, the rearrangement, the tracing of patterns upon, and the stylizing of, what William James called "the random irradiations and resettlements of our ideas." The alternative to the use of fictions is direct exposure to the ebb and flow of sensation. That is not a real alternative, for however refreshing it is to see at times with a perfectly innocent eye, innocence itself is not wisdom, though a source and corrective of wisdom.

For the real environment is altogether too big, too complex, and too fleeting for direct acquaintance. We are not equipped to deal with so much subtlety, so much variety, so many permutations and combinations. And although we have to act in that environment, we have to reconstruct it on a simpler model before we can manage with it. To traverse the world men must have maps of the world. Their persistent difficulty is to secure maps on which their own need, or someone else's need, has not sketched in the coast of Bohemia.

The analyst of public opinion must begin then, by recognizing the triangular relationship between the