Todd B. pointed us here. These are maps that supposedly show the distribution of respondents for each answer choice in a survey exploring accents in different parts of the country. The full set of maps for every question can be found here.
Amusingly, the researchers also provided a map of "all respondents". (I won't ask how the proportions of respondents were reduced to binary output to produce the above maps.)
Here is Todd to lead off the discussion:
Reference: "Dialect Survey", University of Wisconsin-Madison.
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