One sheet; younger woman wearing blue kimono with white patterning and red trim wrestling with a wrinkled elderly figure… https://www.rawpixel.com/image/7637455/image-background-paper-bookFree Image from public domain licenseFigures representing the investigation of nature; in the background, Pliny the elder being killed while investigating… https://www.rawpixel.com/image/13979817/image-background-cartoon-personFree Image from public domain license