There are no media-no media, that is, in a substantial and histor ically stable sense. Media are not reducible to representations such as theater or film or to techniques such as printing or telegraphy. Nor are they reducible to symbols such as letters or numbers. Nevertheless, media are present in all of these things. They cannot be comprehended simply as a method for the processing, storing, or transmission of data. One can, however, reach their historical mode of existence through a special form of questioning: by asking how media determine the conditions they themselves created for what they store, process, and transmit.
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