Any medium necessarily is constituted by some 
ratio of proportion among the human senses. All 
media are necessarily extensions in technological 
form of one or more of our senses. The electronic 
media together add up to an externalization of 
our sensorium. No change in technology can 
touch us save by altering the existing ratio among 
our senses. The nature of sensation being itself 
comprised of a ratio among our various senses, 
any increase or decrease of intensity in any sense 
immediately affects our awareness of the other 
senses.

Marshall McLuhan, “Report on Project in