Wikimedia Commons
The muscle of attention (left); Eyebrow contraction due to bright light (right)
Guillaume Duchenne de Boulogne (1806–1875)
photograph in the National Gallery of Art (NGA 169264)
- Date1854
- Techniquealbumen print
- Dimensions22.1 × 16.7 cm
- Exposée àNational Gallery of Art
Washington, États-Unis