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Warchalking began a couple of years ago in London, and has since spread to the sidewalks of Seattle, New York City and San Francisco.

Nobody knows who invented warchalking, but it seems the practice was inspired by stories of Great Depression--era hoboes who left chalk markings outside the most charitable houses.

Then came the habit of warchalking--which began in London and spread around the globe--in which wardrivers would mark the presence of free networks with a strange hieroglyph--parentheses in reverse order--in chalk on the sidewalk for all to see.