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Koh Buck Song (Chinese: 许木松; born 1963) is a Singaporean writer and poet. He is the author and editor of more than 30 books, including six books of poetry and haiga art. He works as a writer, editor and consultant in branding, communications strategy and corporate social responsibility in Singapore. He has held several exhibitions as a Singaporean pioneer of haiga art, developed from a 16th-century Japanese art form combining ink sketches with haiku poems.