Mécanisme de la physionomie humaine, ou, Analyse électro-physiologique de l'expression des passions / [Guillaume Benjamin… https://www.rawpixel.com/image/14021013/image-face-person-artFree Image from public domain licenseA doctor and his patient laugh during a consultation; behind, a nun stands by the door. Process print after J-A. Faivre… https://www.rawpixel.com/image/13987667/image-cartoon-person-artFree Image from public domain licenseN. Dubois de Chémant demonstrating his own and a woman's false teeth to a prospective male patient with disordered teeth.… https://www.rawpixel.com/image/13962801/image-cartoon-face-personFree Image from public domain licenseTwee lachende jongens (1743 - 1800) by Pieter Louw and Frans Hals https://www.rawpixel.com/image/13779292/twee-lachende-jongens-1743-1800-pieter-louw-and-frans-halsFree Image from public domain license