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Walk through a European city at the turn of the twentieth century, and the streets themselves would have looked like an art gallery. Posters—bright, bold, and impossible to ignore—covered walls, railway stations, and cafés. They advertised everything from plays and cabaret performances to soap, bicycles, and cigarettes. For the first time in history, visual art had escaped the museum. It was public, democratic, and everywhere. From Toulouse-Lautrec’s bohemian Paris to the functional precision of the Bauhaus, posters became the defining visual language of modern life. They merged art and advertising, pleasure and persuasion, and turned the modern city into a…