Even our little drawings and animations we make to help
  comprehend it are all metaphorical: There's no lines and arrows.
  There's no saddles with the saddle points. We're representing
  n-dimensional concepts on a two dimensional illustration: flat
  piece of paper... flat computer screen... and then we have to
  take that and map it to our cognitive systems and SOMEHOW expand
  it into "understanding". There's no points with the points
  either smile emoticon Of course, even to say "2 dimensional
  piece of paper" isn't correct either: It's 4 dimensional, like
  all things are that we're aware of with certainty. So even
  making these "2D" illustrations is a concession to the
  limitations of our visual systems and our limited abilities to
  represent and comprehend things. Sometimes we have to purposely
  "forget" these things in order to progress, but I like reminding
  myself of them frequently as it keeps me humble smile emoticon

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