If you ever come across a photograph of communist-era East Berlin, or modern Pyongyang in North Korea, the cityscapes look drab and featureless. Billboards, advertising hoardings, neon signs, shopfronts and graffiti are conspicuous by their absence.To future eyes, that is how drab today's London and New York will appear. Not because of an even greater proliferation of advertising and street art but because of an in-vogue technology called augmented reality (AR), through which digital information and graphics are overlaid onto the physical world.
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