Blackboard (1877) by Winslow Homer. Original from The National Gallery of Art. 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Audsley-Japanese illustration. Public domain image from our… https://www.rawpixel.com/image/11532418/image-flower-plant-christmasFree Image from public domain licenseMarble backgrounds abstract black https://www.rawpixel.com/image/12223010/image-background-texture-abstractView licenseRoyal Oak (1932), vintage Autumn illustration by William Henry Holmes. Original public domain image from The Smithsonian… https://www.rawpixel.com/image/11064187/image-background-plant-artFree Image from public domain licenseAstronomy without a telescope (1869) illustrated by Colbert, E(lias). Original public domain image from Wikimedia Commons.… https://www.rawpixel.com/image/10184748/image-space-pattern-skyFree Image from public domain licenseJapanese flower fan pattern by G.A. Audsley-Japanese illustration. Public domain image from our own original 1884 edition of… https://www.rawpixel.com/image/10196638/image-flower-plant-artFree Image from public domain licenseFantasiemarmer in verschillende tinten blauw (1900 - 2000) by anonymous https://www.rawpixel.com/image/13733340/fantasiemarmer-verschillende-tinten-blauw-1900-2000-anonymousFree Image from public domain licenseElements of astronomy with explanatory notes, and questions for examination (1855) illustrated by John Brocklesby. Original… https://www.rawpixel.com/image/10184822/image-moon-space-planeFree Image from public domain licenseSolar system artwork (2008) chromolithograph art by Rick Guidice. Original public domain image from Wikimedia Commons.… https://www.rawpixel.com/image/10184900/image-galaxy-face-personFree Image from public domain licenseTransparent solar system, displaying the planets with their orbits, as known at the present day. https://www.rawpixel.com/image/13967599/image-space-moon-skyFree Image from public domain licenseGeography: a map of the world. Colour lithograph, ca.1970, after J. B. Vrients, 1596. https://www.rawpixel.com/image/13968947/image-background-world-map-personFree Image from public domain licenseSakura namiki zu (1820-1858), vintage Japanese illustration by Hiroshige Andō. Original public domain image from the Library… https://www.rawpixel.com/image/11066184/image-flowers-plant-artFree Image from public domain licenseSnowflakes nature backgrounds repetition. 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Original public domain image from… https://www.rawpixel.com/image/9407659/image-people-arts-world-mapFree Image from public domain licenseAstronomy: a star map of the night sky in the northern hemisphere, with the names of the constellations. Coloured engraving. https://www.rawpixel.com/image/13957631/image-stars-paper-frameFree Image from public domain licenseArabic characters in gold and black. Colour woodcut by an Indian artist, late 1800s. https://www.rawpixel.com/image/13968086/image-background-art-patternFree Image from public domain licenseGreen wall background backgrounds canvas blackboard. https://www.rawpixel.com/image/12416513/image-background-texture-aestheticView licenseAstronomy: an oval chart showing how different planets affect different parts of a man's body. Engraving by P. Miotte. https://www.rawpixel.com/image/13959672/image-background-cartoon-personFree Image from public domain licenseAstronomy: the Aurora Borealis, with pine trees in the foreground. 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