Previously:

Cartographers Have Been Hiding Covert Illustrations Inside Swiss Official Maps - https://news.ycombinator.com/item?id=22490017 - Mar 2020 (22 comment)

Cartographers Have Been Hiding Covert Illustrations Inside Swiss Official Maps - https://news.ycombinator.com/item?id=22461602 - Mar 2020 (1 comment)

Cartographers Have Been Hiding Covert Illustrations Inside Swiss Official Maps - https://news.ycombinator.com/item?id=22407413 - Feb 2020 (1 comment)