The OutOfThePinkSky Artfire studio creates what seem like ordinary hip earrings to the unsuspecting observer. Open the earrings, though, and there is a secret coded message written in a diagrammatic cipher. Historically famous, it's a spy communication by Velvalee Dickinson, who used her doll business to send information to the Japanese in World War II.
The design is called Papa November, after one of the many pop culture-inspired rhythmic broadcasts of unknown origin that appear on shortwave radio frequencies. See more of OutOfThePinkSky's work above.
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