Labels:bulletin board | dog | person | poster | press OCR: Tetrads: Laws of the Media McLuhan invented the Laws of the Media to explain the effects of man' inventions and technologies Everything from the paper clip 1o othe airplane. He took any tool or invention and aisked four questions What does enhance What does make obsolete What does bring back And when pushed to extremes what does flip into He called the four questions Tetrad Pretty confusing eh? Why not try a few yourself? nvention usked confusinc
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