The Medium is the Massage: An Inventory of Effects (1967) ...was (Marshall) McLuhan's best seller, "eventually selling nearly a million copies worldwide." Initiated by Quentin Fiore, McLuhan adopted the term "massage" to denote the effect each medium has on the human sensorium, taking inventory of the "effects" of numerous media in terms of how they "massage" the sensorium.

Fiore, at the time a prominent graphic designer and communications consultant, set about composing the visual illustration of these effects which were compiled by Jerome Agel. Near the beginning of the book, Fiore adopted a pattern in which an image demonstrating a media effect was presented with a textual synopsis on the facing page. The reader experiences a repeated shifting of analytic registers—from "reading" typographic print to "scanning" photographic facsimiles—reinforcing McLuhan's overarching argument in this book: namely, that each medium produces a different "massage" or "effect" on the human sensorium.
~ wikipedia

This tumblr is a visual homage to the incredible prescience of Marshall's work.