Visual display of quantitative information: some definitions

Map (1520s, shortening of M.E. mapemounde “map of the world” (late 14c.), from M.L. mappa mundi “map of the world,” first element from L. mappa “napkin, cloth” (on which maps were drawn), said by Quintilian to be of Punic origin (cf. Talmudic Heb. mappa, contraction of menafa “a fluttering banner”))
a visual representation of an area—a symbolic depiction highlighting relationships between elements of that space such as objects, regions, and themes.  Many maps are static two-dimensional, geometrically accurate (or approximately accurate) representations of three-dimensional space, while others are dynamic or interactive, even three-dimensional. Although most commonly used to depict geography, maps may represent any space, real or imagined, without regard to context or scale [Wikipedia and Online Etymology Dictionary]

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Overlay of European cities on North America (and vice versa)

I thought this was interesting — just in terms of how far north or south stuff is in the U.S. versus Europe.  Not what I would expect — Budapest is further north than the Twin Cities?  And actually, a good chunk of Europe is in Canada?  Some stuff is what you expect, though — the Mediterranean climate of California and the Napa Valley wine growing region, etc.

Transposition on maps of various kinds is an interesting idea…