What isn't a map?

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Michael raises a good question: 'what isn't a map'?

If we use Krygier's definition, 'a graphic statement that locates facts,' then a typed text my not be a map by virtue of its non-graphic form. Abrams and Hall define mapping, as 'a means of making arguments and processes visible.' So is it the visual or graphical character that distinguishes maps? What about the road sign above? Is it the arrows that make it a map? Or is a sign just a sign?