Questions for Reading Discussions: "The Medium is the Massage"

My two questions for discussion include:

McLuahn states that people tend to focus on the obvious, which is the content that provides valuable information but tend to miss the structural changes or changes made over long periods of time. Why is it that we as humans don’t realize the social implication of the medium until after the change or until someone points them out?

Each visual illustration within the book plays a specific role. What “effect” or “massage” did the pictures throughout the book have on your human sensorium?