Spies (or agents, or streetwalkers, or HUMINT assets: whatever they were called these days) no longer identified each other in public with a red carnation through the buttonhole of a suit jacket, or a rolled-up copy of last week’s SPIEGEL under the arm. (Suits were conspicuously formal, paper magazines unusual.) But they still needed a reliable way of hooking up in public without attracting attention. The preferred method was always to disguise your recognition signal as something unexceptional. You could both play for the same team in an augmented reality game. Or you could pretend to be
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