“All media are extensions of some human faculty-physic or physical.”
McLuhan believed that it is in our nature to be obsessed to obtain more than what we already have. For instance, most of us are obsessed with fashion and vehicles because it makes us feel like we stand out in a crowd. McLuhan considered these things “extensions” because they enhance certain aspects about humans. The car, for example, is an extension of our foot because the car enhances our transportation.
People of wealth have a tendency to show off their wealth through the cars they drive, or the clothes they wear. But rarely do humans consider the negative aspects. Some of these clothes are made from factories that devalues their workers. Driving cars enhance pollution, hastening global warming. But humans forego these negative aspects in favor standing out.