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1. What does the medium EXTEND? Every new medium enhances, amplifies, or extends some human capacity. This might be a body part (the camera is an extension of the eye), a previous medium (the telephone is an extension of the telegraph) or even an emotion (smoke detectors extend our sense of smell, but also our feeling of security). This is the most obvious question to answer as it is almost always the reason we decide to employ a medium. 2. What does the medium MAKE OBSOLETE? Every new medium makes an older technology obsolete. In this case, the term “obsolete” does not necessarily mean that the technology disappears, rather that the function of that previous medium changes. For example, the automobile made the horse and buggy obsolete. This means that the horse and buggy went from being used for transportation to being used for quaint entertainment and romance. We may also see the part of ourselves that is extended become obsolete. The wheel makes our feet obsolete; they are used less for transporting ourselves and more for operating levers that cause us to be transported. 3. What does the medium RETRIEVE? Every new medium retrieves some ancient experience or media from the past. In other words, there is no such thing as a completely new technology. When we discover which medium is retrieved we can study its effects in hindsight in an effort to anticipate the future of the new medium. For example, the medium of e-mail retrieves the telegraph. If we want to understand the future effects of e-mail, we would be wise to study the cultural effects of the telegraph in the 1800s. Answering this question helps us investigate the last question. 4. What does the medium REVERSE INTO? This is the law where we discover the dangers of media. When pushed to its extreme, every medium will reverse into its opposite intention. For example, when pushed to the extreme, the automobile — a medium intended to increase the speed of transportation — reverses into traffic jams and fatal accidents. This law of reversal can often be the most difficult to predict.
In a global information environment, the old pattern of education in answer finding is one of no avail...Survival and control will depend on the ability to probe and to question in the proper way and place...The need is not for fixed concepts but rather for the ancient skill of navigating through an ever uncharted and unchartable milieu. Else we will have no more control of this technology and environment than we have of the wind and the tides.5