Sixteen French doctors with attributes of their specialties. Colour lithograph by A. Barrère, ca. 1906. https://www.rawpixel.com/image/13960983/image-cartoon-person-artFree Image from public domain licenseStudies van een paard (1845 - 1926) by Willem Carel Nakken https://www.rawpixel.com/image/13738883/studies-van-een-paard-1845-1926-willem-carel-nakkenFree Image from public domain licenseStaand paard, naar links (1845 - 1926) by Willem Carel Nakken https://www.rawpixel.com/image/13787957/staand-paard-naar-links-1845-1926-willem-carel-nakkenFree Image from public domain license