"Diaper backward spells repaid. Think about it"

Marshall McLuhan is using wordplay to make a point about how details and communication can be interpreted in different ways. By explaining that "diaper" in reverse spells "repaid," he is showing how the same letters and sounds can create two entirely various words with opposite significances. This highlights the idea that words and messages can be interpreted and understood in different methods, depending on the context and the viewpoint of the individual getting them. Ultimately, the quote is a reminder of the importance of mindful communication and thoughtful interpretation in our interactions with others.