During the 19th and 20th centuries hobos (a wandering homeless worker) developed hobo codes, a system of marks made with chalk to help each other find useful opportunities and avoid danger. Golan Levin and Asa Foster III have updated this system for the digital generation with QR code stencils.
Tot articolul: http://blog.ponoko.com/2011/07/20/hobo-codes-for-digital-nomads/
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