Medium is the Message
The form of a medium embeds itself in any message it would transmit or convey, creating a symbiotic relationship by which the medium influences how the message is perceived.
EverydayConcepts.io
Origin
Canadian media theorist Marshall McLuhan introduced this phrase in his 1964 book Understanding Media: The Extensions of Man, written while he directed the Centre for Culture and Technology at the University of Toronto. McLuhan argued that a medium's form — not its content — reshapes human perception and social organization, famously illustrating the idea with the electric light bulb, which carries no "content" yet profoundly alters human behavior.
Updated February 22, 2026