A flowering marvel of Peru plant (Mirabilis jalapa) and nine diagrams illustrating refraction of light. Coloured engraving… https://www.rawpixel.com/image/13954310/image-cartoon-flower-plantFree Image from public domain licenseOptics: diagrams of reflection and refraction of light. Coloured engraving by J. Pass, 1820. https://www.rawpixel.com/image/13956875/image-paper-art-lightFree Image from public domain license