Laws of Media: The New Science

TL;DR — McLuhan’s posthumous last book, completed by his son, setting out the ‘tetrad’: four questions about what any medium enhances, obsolesces, retrieves and reverses into.

Marshall McLuhan’s final book, completed and published by his son Eric McLuhan through the University of Toronto Press after his death in 1980. Eric’s preface explains it began as a request to revise Understanding Media for a second edition and grew into a new work.

The book contrasts “visual space” (the linear, sequential space associated with the alphabet and print) with “acoustic space” (the simultaneous, all-at-once space of oral cultures and electric media), and links these to the two hemispheres of the brain. It then proposes the “laws of media” as four questions to ask of any artifact: what does it enhance, what does it make obsolete, what does it retrieve that had been lost, and what does it reverse into when pushed to an extreme. The longest chapter is a catalogue of such tetrads applied to dozens of technologies and ideas, followed by a chapter on media poetics.

What it is: A classic of media theory by its best-known author, in print and under copyright.

Where this came from

• A copy saved in October 2026.

255 pages. A PDF copy is held in Kyle’s private archive; it is not linked or shared here.