He uses bodily metaphors of amputation and prosthesis to explain how we have ceded much of our sensory organs to these media, which then structure how we interact with the world and the other people in it. The point is that it isn’t the content of a medium which matters but the medium itself which most meaningfully changes the ways humans operate.
The first is his pithy “the medium is the message,” a statement he returns to throughout to explain exactly what he means and some of the intricacies of the implications thereof. Marshall McLuhan has two big concepts that, tellingly, make up the first two chapters of this massive text. Summary & Implications: What is the author’s project and why is it important now? What’s the narrative about the field that’s emerging from the reading? What narratives are silent? Whose voices are silent? Understanding Media: The Extensions of Man.
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