A plant (Peperomia acuminata): flowering stem. Coloured engraving, c. 1817. https://www.rawpixel.com/image/13959414/plant-peperomia-acuminata-flowering-stem-coloured-engraving-1817Free Image from public domain licenseSix stages of a horse race, including running, training, winning, preparing to start, rubbing down and walking over the… https://www.rawpixel.com/image/13968531/image-dog-paper-horseFree Image from public domain license