The Swiss art historian whose 1915 Principles of Art History Cameron produces as the hinge of an unstated genealogy: the man who taught Giedion, carried Hildebrand's tactile reading of visual form forward, and gave McLuhan a precedent for treating effects rather than sensuous facts as what counts. He arrives in dialogue 70 twice over — first in a 1959–60 passage McLuhan wrote, then in a 1961 sentence naming him as Giedion's teacher — and it is that second appearance that lets Bob assemble the seven-name chain he writes down at the end of the session. New to it — start with dialogue 70 for the 1961 sentence.
Across the dialogues
Enters as the missing link in the tactility genealogy — the art historian through whom the whole chain from Hildebrand down to Carpenter first becomes sayable as a sequence
The warrant McLuhan gave himself in his own words — Wölfflin's method is not an analogy for media study but the confirmation that media study was already possible.
"in 1915, Heinrich Wölfflin published his Principles of art history which has since then revolutionized the study of many matters besides art. This entire approach confirms what I discovered about media."
What made Wölfflin usable: he studied not styles but the contest between them — the ratio question, put to art history a half-century before McLuhan put it to media.
"He was looking at dominance within art history and trying to understand how the dominance worked with each other."
The link that turns a list of names into a transmission — Wölfflin is the channel by which the tactile reading of visual form reaches the figure Cameron calls McLuhan's central influence.
"And Wölfflin was the professor, the mentor of Giedion."
The 1961 sentence that supplies the whole chain at once — McLuhan had already written the lineage down, and neither speaker had read it as a lineage until this night.
"The art historian Heinrich Wölfflin taught the Hildebrand stress on visual forms as haptic or tangible tactile. And Wölfflin's pupil, Siegfried Giedion, embodied it in his Space, Time, and Architecture."
Cameron blocks the tidy descent Bob wants — Hildebrand did not teach Wölfflin, so the chain is a sequence of influence, not a line of instruction.
"No, they were contemporaries."
Connections
Cameron names Wölfflin as Giedion's professor and mentor — the hinge that carries the tactile reading of visual form into McLuhan's central influence.
Cameron corrects Bob's assumption of a teacher-pupil line — the two were contemporaries, with Hildebrand perhaps first on tactility.
McLuhan credits Wölfflin's 1915 Principles of Art History with confirming what he discovered about media — that effects, not sensuous facts, are what count.