Marshall McLuhan (1911-1980) is best known as a media theorist-many consider him the founder of media studies-but he was also an important theorist of art. Though a near-household name for decades due to magazine interviews and TV specials, McLuhan remains an underappreciated yet fascinating figure in art history. His connections with the art of his own time were largely unexplored, until now. In Distant Early Warning, art historian Alex Kitnick...