The chalk markings appeared on the sidewalk a few days after I moved into my new house. A symbol that looked like two half-moons back to back was scrawled beneath the words "Outside the Box." What did it mean? Was it some bizarre pagan ritual conducted by aficionados of business slogans? Nope--Outside the Box was the name I had assigned on my computer to my wi-fi network. There was only one explanation: I'd been warchalked.
Warchalking began a couple of years ago in London, and has since spread to the sidewalks of Seattle, New York City and San Francisco. Wireless guerrillas...
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