# Mécanisme de la Physionomie (The Mechanism of Human Facial Expression)

- By: Guillaume-Benjamin-Amant Duchenne (de Boulogne) (French, 1806 - 1875)
- Date: 1862
- Medium: album cover
- Classification: Volume
- Dimensions: overall: 41 × 29 × 5 cm (16 1/8 × 11 7/16 × 1 15/16 in.)
- Culture: French
- Credit line: W. Bruce and Delaney H. Lundberg Fund, in Honor of the 25th Anniversary of Photography at the National Gallery of Art
- Museum: [National Gallery of Art](https://www.nga.gov/collection/art-object-page.205204.html)
- Rights: [Public domain (NGA Open Access, CC0)](https://creativecommons.org/publicdomain/zero/1.0/)
- Picture: https://api.nga.gov/iiif/31c84040-67bb-4d01-a091-be87555980ce/full/!1920,1080/0/default.jpg
- Who can see it: Tweens profiles and older (museums give no ratings; placed by Invisible Network from the museum's own words)