Sigmund Freud, Stanley Hall, Carl Gustav Jung, Abraham Arden Brill, Ernest Jones and Sándor Ferenczi. Photograph, 1909. https://www.rawpixel.com/image/13991591/photo-image-face-person-clothingFree Image from public domain licenseBritish politicians including W.E. Gladstone, Rosebery, Chamberlain and Earl Spencer, in the role of British soldiers in… https://www.rawpixel.com/image/13976754/image-horse-cartoon-peopleFree Image from public domain licensePortret van een man (1856 - 1933) by Emile Charles Wauters https://www.rawpixel.com/image/13790098/portret-van-een-man-1856-1933-emile-charles-wautersFree Image from public domain licenseEdward Theodore Brewis, Hermann Thoms, Frederick Belding Power, Peter MacEwan and William Lamond Howie. Photograph, 1909. https://www.rawpixel.com/image/13971169/photo-image-person-clothing-manFree Image from public domain license