Swiss cartographers do have a sense of humor!
https://www.atlasobscura.com/articles/swiss-map-secrets
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The UK OS maps also have marks on the maps which don’t exist in reality such as squiggles in an otherwise straight drainage channel.
It was for a different purpose though - it was to prove that other companies had copied the maps.
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That’s clever. Reminds me of the Van Halen and brown M&Ms story
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