I understood the metaphor because of the argument of the dangers of computers, especially the internet. Some people believe that computers are dangerous because of the things that you can access on the internet. Just because there are some "dangers" doesn't mean that you should negate all the wonderful uses that DO exist with computers. This is why I understood the metaphor. The same was true for the pencils in that metaphor. I think as educators, we should frequently use metaphors. By comparing things, it helps put things into a different perspective and can help enlighten someone who never viewed something in that way.
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