Turns out that some Swiss cartographers have a sense of whimsy. Cartographers working for the Swiss Federal Office of Topography have inserted tiny drawings into the lines and whorls they put on maps.
Some of the drawings stayed hidden for decades. Unfortunately, Swisstopo removes them once found and the maps with the secret hidden illustrations gradually get replaced in circulation. It's left up to new wily cartographers to get even more clever in their hidden work.
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