Human expressions
This selection of photographs is drawn from the books Mecanisme de la Physionomie Humaine, Duchenne de la Boulogne, Paris 1862; and The Expression of Emotions in Man and Animals, Charles Darwin, London 1872 (Wikipedia link to "Facial Expressions").

In his book, Darwin was investigating the evolution of human psychology and, the ways in which the human facial expression of emotion might be common across age, race and species. His work drew heavily on the physiological research of Duchenne de Boulogne. Duchenne’s primary interests were in the relationships between the facial muscles and expression, theories he demonstrated by electrically stimulating specific muscle groups.

Duchenne took his own photographs, while the photographs in The Expression of Emotions in Man and Animals were made by Oscar Gustav Rejlander (1813-1875), Adolph Diedrich Kindermann (1823-1892) and Duchenne.
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