Oh dear - I stumbled upon
   [1]https://en.wikipedia.org/wiki/Analogy - one of my favorite
   topics. I never actually read the Wikipedia page on analogy even
   though I love analogy and metaphor. Considering that many
   physical systems are nearly perfect (but not quite) analogues of
   each other, if you learn one, you've learned the 'gist' of all
   of them.... and the same is true for analogies in general. Good
   analogies can unlock doors (there's an analogy/metaphor) to MANY
   different ideas. Oh dear... I gotta be careful or I'll be
   clicking off from that page and coming back to it all day long
   if I could smile emoticon

References

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   1. https://l.facebook.com/l.php?u=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FAnalogy&h=-AQEQNSJ0