Marshall McLuhan was an influential thinker who studied the impact of media and technology. He is quoted as saying that "the medium is the message" and that we fail to fully consider how the choice of medium shapes the message conveyed and its reception. The document presents several of McLuhan's ideas about media and how new technologies can enhance some things, retrieve others, reverse roles, and make older technologies obsolete. It also suggests these ideas remain highly relevant to understanding changes in digital media and user experience design.