Steganography
A new approach for billboard advertising. Advertising which has the engaging and attractive feature to be invisible, except for the intended viewing target audience. There are many commercial applications from landmarks, shop advertising facades, signs for the visually impaired to name but a few. The world's fourth-largest metropolis and Brazil's most important city, São Paulo, became the first city outside of the communist world to put into effect a radical, near-complete ban on outdoor advertising, there is no better time to look for new and exciting solutions to this problem.
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