Photograph of President Abraham Lincoln. Original public domain image from Flickr https://www.rawpixel.com/image/8799524/photo-image-face-art-public-domainFree Image from public domain licenseStudies for the Libyan Sibyl (recto); Studies for the Libyan Sibyl and a small Sketch for a Seated Figure (verso) by… https://www.rawpixel.com/image/9184318/image-dark-academia-john-singer-sargent-frescoFree Image from public domain licenseAutographs of Famous Figures 2 (1894). Digitally enhanced from our own original plate. https://www.rawpixel.com/image/431543/free-illustration-image-vintage-paper-collage-typographyFree Image from public domain licenseAutographs of Famous Figures 1 (1894). Digitally enhanced from our own original plate. https://www.rawpixel.com/image/431539/free-illustration-image-collage-vintage-paper-handwrittenFree Image from public domain licensePostcard: Paul Klee to Katherine Dreier, Paris (1922) by Paul Klee. Original from The Beinecke Rare Book & Manuscript… https://www.rawpixel.com/image/2988846/free-illustration-image-klee-abstract-painting-peopleFree Image from public domain licenseFamous chemists, gathered around a table. Lithograph by Shapper after J.E. Mayall, 1850. https://www.rawpixel.com/image/14019086/image-face-people-bookFree Image from public domain license