Tribal age - The first period in history that McLuhan describes is the Tribal Age, a time of community because the ear is the dominant sense organ. This is also known as an acoustic era because the senses of hearing, touch, taste, and smell were far more strongly developed than the ability to visualize.
Literary Age - The second stage is the Literary Stage, a time of private detachment because the eyes is a dominant sense organ; also known as the visual era. Turning sounds into visible objects radically altered the symbolic environment.
Print Age - The third stage is the Print Age, mass production of individual products due to the invention of the printing press. It gave the ability to reproduce the same text over and over again, making multiple copies. With printing came a new visual stress, the portable book.
Electronic Age - Lastly, the Electronic Age, an era of instant communication and a return to an environment with simultaneous sounds and touch. It started with a device created by Samuel Morse's invention of the telegraph and led to the telephone, the cell phone, television, internet, DVD, video games, etc. This ability to communicate instantly returned us to the tradition of sound and touch rather than sight. This phenomenon is called the global village.