Experiments in physiology. Facial expressions; Frowning
- Guillaume Benjamin Amand Duchenne de Boulogne
Licence: Public Domain Mark
Credit: Experiments in physiology. Facial expressions; Frowning. Wellcome Collection. Source: Wellcome Collection.
Licence: Public Domain Mark
Credit: Experiments in physiology. Facial expressions; Frowning. Wellcome Collection. Source: Wellcome Collection.