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We are raiding the Guardian long read archives to bring you some classic pieces from years past, with new introductions from the authors. This week, from 2022: For years Tsang Tsou-choi daubed his eccentric demands around Hong Kong, and the authorities raced to cover them up. But as the city’s protest movements bloomed, his words mysteriously reappeared Written and read by Louisa Lim. Help support our independent journalism at theguardian.com/longreadpod