Guillaume-Benjamin-Amant Duchenne (de Boulogne), Spasm of m corrugator supercilii under very strong light (left); A relaxed face (photographed in full sunshine) (right), 1854-1855 Spasm of m. corrugator supercilii under very strong light (left); A relaxed face (photographed in full sunshine) (right); between 1854 and 1855 date

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Photo credit: © AlFA Visuals / Alamy / Afripics
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