People go ga-ga over the brain and all it can do. I'm glad to
  have one honestly. But, dissatisfied over common analogies to
  the brain; telephone switchboard, Internet, computers,
  electricity, physics, I tried to find something more accurate.
  Then, when I discovered Cerebrospinal fluid and how it
  functions. There. That works better for me. Engine parts washer.
  It's funny because I went into the TOTAL OPPOSITE direction of
  what I normally do. I usually get all abstract. But to get very
  solid, functioning metaphor, I went into a direction I knew
  nothing about: cars, engines, etc. I realized I always talked
  thought engines, brain "running" (analogizing to an engine
  running) - slow, fast, etc. But I wondered just HOW LITERALLY I
  could take that analogy.

  Turns out, a lot closer to reality than I would've ever thought
  possible. [1]t Yeah; it's extremely unsettling. I made the
  animated .gif above just a few minutes ago. I searched for a
  video that showed an engine parts cleaner vibrating, with the
  cleaning fluids recirculating... and wanted something kinda
  pretty.

  But then in the middle of one video, I found THIS: the oil-water
  separation feature. The bubbling, primitive goo was _very_
  striking and almost painful to look at. I knew then it was
  perfect.[2]NPH_MRI_272_GILD [3]giphy

References

  Visible links
  1. https://www.facebook.com/oliver.springett.5?hc_location=ufi
  2. http://icopiedyou.com/wp-content/uploads/2015/08/NPH_MRI_272_GILD.gif
  3. http://icopiedyou.com/wp-content/uploads/2015/08/giphy.gif