Dr. Marshall McLuhan
The medium is the message
All media are extensions of human faculty--psychic or physical
All media work us over completely. They are so persuasive in their personal, political, economic, aesthetic, psychological, moral, ethical, and social consequences that they leave no part of us untouched, unaffected, unaltered. The medium is the massage. Any understanding of social and cultural change is impossible without a knowledge of the way media work as environments.

The wheel is an extension of the foot 
The book is an extension of the eye
Clothing is the extension of the skin
Electric circuitry, is an extension of the central nervous system
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