# Figure 51: À droite, contraction partielle de l'élévateur commun de l'aile du nez et de la lèvre supérieure: mécontentement, mauvaise humeur; à gauche, repos

- By: Guillaume-Benjamin-Amand Duchenne (de Boulogne) (French, 1806–1875)
- By: Adrien Tournachon (French, 1825–1903)
- Date: c. 1856, printed 1862
- Medium: Albumen print from glass plate negative
- Classification: Photograph
- Dimensions: Image: 19.5 x 17 cm (7 11/16 x 6 11/16 in.); Paper: 21.5 x 17 cm (8 7/16 x 6 11/16 in.); Mounted: 41.1 x 27.5 cm (16 3/16 x 10 13/16 in.)
- Credit line: Severance and Greta Millikin Trust
- Museum: [Cleveland Museum of Art](https://clevelandart.org/art/2018.10)
- Rights: [Public domain (CC0)](https://creativecommons.org/publicdomain/zero/1.0/)
- Picture: https://openaccess-cdn.clevelandart.org/2018.10/2018.10_web.jpg
- Who can see it: Tweens profiles and older (museums give no ratings; placed by Invisible Network from the museum's own words)

This photograph is part of the first systematic exploration of the physiology of human facial expression. In order to demonstrate how each individual muscle contributed to creating an expression, Duchenne stimulated one or more muscles on one side of the face and left the other at rest.