It's true and sometimes our concepts become trapped by metaphors
  that are stretched beyond their usefulness. One example:
  Particle physics. It's very useful to see this stuff as "weird
  particles". Pool/Billiard Balls. Lots of very practical uses for
  this metaphorical analogy as it were. But then, it reaches its
  limit. And if we're still thinking in terms of weird pool balls,
  even unconsciously, and devoting lots of math at these weird
  imaginary pool balls instead of looking for unseen novel
  concepts, we'll be confused and possible go the wrong way.

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