Authors:

The wheel is an extension of the foot, the book is an extension of the eye, clothing an extension of the skin, electric circuitry an extension of the central nervous system.

Marshall McLuhan, Bruce R. Powers (1989). “The global village: transformations in world life and media in the 21st century”, Oxford University Press, USA
The wheel is an extension of the foot, the book is an extension of the eye, clothing an extension of the skin, electric circuitry an extension of the central nervous system.