Guillaume-Benjamin-Amant Duchenne (de Boulogne), Slight lowering of the angle of the mouth due to depression (left); False laughter (right), 1854-1856 Slight lowering of the angle of the mouth due to depression (left); False laughter (right); between 1854 and 1856 date
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Photo credit: © AlFA Visuals / Alamy / Afripics
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