Nagel says we have to develop such a phenomenology to describe the sonar experiences of bats, but it would be also possible to begin with humans. One might try to develop concepts that could be used to explain to a blind person blind from birth what it was like to see. The loose, intermodal analogies, for example, red is like the sound of a trumpet, which crops up in discussions of the subject or of literal use. But structural features of perception might be more accessible to objective description, even though something would be left out.

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