I think metaphors are mostly the effect of limitations. Being
  humans, it's how we understand things. Some metaphors are so
  useful, we forget they are metaphors. We also build metaphors on
  top of metaphors on top of metaphors. All useful. But, it's when
  we forget something is a metaphor ultimately that we can lose
  sight. A constant danger. Even if the couple of sentences I just
  wrote, there's numerous metaphors. I don't think we can really
  escape using them in some way. Ultimately I think it goes to the
  whole "the finger that point the moon, isn't the moon" idea. As
  long as we keep the representative nature of explanation (in
  stories and symbols), progress won't stagnate.

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