How is Marshall McLuhan's idea of "medium is the message" related to the Postmodernism?

I had to pare down the question because I think that both
Spiegelman's work and McLuhan's work represents postmodern thought in separate ways. At the same
time, this is not going to be easy because McLuhan's ideas are both complex and intricate.
McLuhan's phrase of "The medium is the message" means that how art or media is conveyed is as
important, if not more important, than the content itself. Message and messenger are not
opposites, but rather one in the same:

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McLuhan proposes that a
medium itself, not the content it carries, should be the focus of
study. He said that a medium affects the society in which it plays a role not only by the content
delivered over the medium, but also by the characteristics of the medium
itself.

This is postmodern for a
variety of reasons. On one hand, McLuhan's idea about medium and message represent the essence of
deconstruction because it seeks to go beyond the traditional binary opposition of "medium" and
"message." In McLuhan's idea, medium is the message. How a society understands the message is
almost as telling as the message, itself. For example, Spiegelman's work,
Maus, says more that it is a comic strip about the Holocaust than its
content about the time period. The fact that more children have read Maus
than Night by Elie Wiesel might speak volumes. McLuhan's idea is
also postmodern because it forces the lens of analysis on personal identity and social reality,
examining how both are dependent and independent of one another. This is postmodern because it
seeks to locate understanding in both realms, and not one or the other. The fact that McLuhan's
study is in media is also postmodern in that the movement was concerned with different ways to
connect human experience to literature and to analyze different modes of being in the
world.