William Slocombe’s “Signage System” project offers a way for members of organized crime to communicate with each other.

William Slocombe, a graphic and media design student at London College of Communication, created a way for members of secret organizations or ‘organized crime' to communicate with each other around South London.

The Signage System involves writing or printing messages in negative type, that way it won't be easily readable by just anyone, and then using a positive overlay on an iPhone app to decipher the message. Only those with the positive overlaps will be able to read the message.

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