Mapping from

  • discrete domain: length × width →
  • discrete codomain: {A,B,Q,Q+} = stocking size.

Two things.

  1. First, it’s a scale in the sense of Hadley Wickham’s ggplot: an association between logic and graphics.
  2. Second, it depicts a well-known phase space.

    Just like certain pressure & temperature combinations make plumbum

    appear as a solid, liquid, or gas [for instance the point (3180, 1 atmosphere)] — so do certain height & weight combinations recommend a stocking of A, B, or Q.
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