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On a bright May afternoon in 2007, a German artist and printmaker named Hans-Jürgen Kuhl took a seat at an outdoor café directly opposite the colossal facade of the Cologne Cathedral. He ordered an espresso and a slice of plum cake, lit a Lucky Strike, and watched for the buyer. She was due any minute. Kuhl, a lanky 65-year-old, had to remind himself that he was in no rush. He’d sold plenty of artwork over the years, but this batch was altogether different. He needed to be patient.