McLuhan had provided what would become a classic example of this method a dozen years earlier, at a seminar he was addressing at Columbia University’s Teacher’s College in November 1955. He began with a consideration of the alphabet, the x-ray, and Freudian psychoanalysis, and proceeded to the printing press, the telegraph, radio, and television. Louis Forsdale, the seminar leader who had invited McLuhan-hardly known then, outside of those who had read his one book, The Mechanical Bride (1951), or who subscribed to the journal Explorations that McLuhan edited with his fellow Canadian Edmund Carpenter-took a question from the audience.