In the novel by Charles Dickens, “a tale of two cities”, Madame Defarge knits coded messages into her work for the resistance.
During our Revolutionary war, women would hang wash on clotheslines. Different colors, clothing types, etc. would mean something to the American forces, food here, room for the night, that kind of thing.
Great post on coded messages—I learn something new here every day.
We may have to go there at some point.
The NSA computer may have trouble figuring out what the color of our laundry means.
:-)
Same with the Underground Railroad -- quilts hung outside with coded patterns.