PAUL D STEWART / SCIENCE PHOTO LIBRARY PAUL D STEWART / SCIENCE PHOTO LIBRARY
Diagram of the muscles of the face from Darwin, Ref Sir C. Bell, page 24, Darwin, C. R. 1872. London: John Murray. First edition. Original heavy toning of paper of this old book copy kept here for effect. Darwin used this striking illustration to show how many facial muscles could be deployed to indicate human emotion.
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