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* Nearly every text that I look at uses two modes of communication: (a) language as writing and (b) image. Yet TESOL professionals continue to act as though language fully represented the meanings they wish to encode and communicate. Yes, they admit that other features are important, but if pressed, the linguist and the applied linguist (the language teacher, let us say) would maintain that their business was language, after all, and these other things were someone else's to look after.
Günther Kress (Sat,) studied this question.