The muscle of attention (left); Eyebrow contraction due to bright light (right)

1854–1856

Medium: albumen print
Dimensions: image: 22.1 × 16.7 cm (8 11/16 × 6 9/16 in.) mount: 40.3 × 27.7 cm (15 7/8 × 10 7/8 in.)
Genre: Photograph
Museum: National Gallery of Art, Washington, DC, US

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