Is a picture worth a thousand words?
   No.

   A picture is an image that falls on the retina and projects into
   the brain.

   A thousand words are read and utilize whatever ways it is that
   we read and comprehend the concepts within.

   Worth? That's economics. You can trade a thousand words for a
   picture, or a picture for a thousand words.

   It's metaphors. They're metaphors that lead you to a desired
   conclusion by connecting concepts from different spheres of
   knowledge together. The strength comes from fields unrelated to
   the concept being expressed.

   They're tricky to spot because they're so common, but once you
   see them, it's a new layer of knowledge.

   Of course knowledge doesn't come in layers. Nor does it "come"
   anywhere. It doesn't move.