used (the content), McLuhan provides the example of mechanization, pointing out that regardless of the product (e.g.. corn flakes or Cadillacs), the impact on workers and society is the same. In a further exemplification of the common unawareness of the real meaning of media, McLuhan says that people "describe the scratch but not the itch". As an example of "media experts" who follow this fundamentally flawed approach, McLuhan quotes a statement from "General" David Sarnoff (head of RCA), calling it the "voice of the current somnambulism". Each medium "adds itself on to what we already are", realizing "amputations and extensions" to our senses and bodies, shaping them in a new technical form. As appealing as this remaking of ourselves may seem, it really puts us in a "narcissistic hypnosis" that prevents us from seeing the real nature of the media. McLuhan also says that a characteristic of every medium is that its content is always another (previous) medium. For an example in the new millennium, the Internet is a medium whose content is various mediums which came before it—the printing press, radio and the moving image. An overlooked, constantly repeated understanding McLuhan has is that moral judgement (for better or worse) of an individual using media is very difficult, because of the psychic effects media have on society and their users. Moreover, media and technology, for McLuhan, are not necessarily inherently "good" or "bad" but bring about great change in a society's way of life. Awareness of the changes are what McLuhan seemed to consider most important, so that, in his estimation, the only sure disaster would be a society not perceiving a technology's effects on their world, especially the chasms and tensions between generations. The only possible way to discern the real "principles and lines of force" of a media (or structure) is to stand aside from it and be detached from it. This is necessary to avoid the powerful ability of any medium to put the unwary into a "subliminal state of Narcissus trance", imposing "its own assumptions, bias, and values" on him. Instead, while in a detached position, one can predict and control the effects of the medium. This is difficult because "the spell can occur immediately upon contact, as in the first bars of a melody." One historical example of such detachment is Alexis de Tocqueville and the medium of typography. He was in such position