Optics: interference phenomena, exhibited by diffraction gratings. Coloured mezzotint by M. Rapine [1883], after B. Desgoffe. https://www.rawpixel.com/image/13968649/image-background-pattern-circleFree Image from public domain licenseElevator Grille from the Manhattan Building, Chicago, Illinois by Jenney & Mundie (Architect) https://www.rawpixel.com/image/8937836/image-grid-wood-patternFree Image from public domain licenseRookery Building, 209 South La Salle Street, Chicago, Illinois: Grille from Interior Central Court by Burnham and Root… https://www.rawpixel.com/image/8937769/image-grid-pattern-artFree Image from public domain licenseBusiness people png handshake sticker, character illustration on transparent background. Free public domain CC0 image. https://www.rawpixel.com/image/6489623/png-sticker-public-domainFree PNG from public domain licenseChrysanthemums and Autumnal Plants (late 17th–early 18th century) painting in high resolution by anonymous. 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Original public domain image from Flickr https://www.rawpixel.com/image/9648660/photo-image-face-hands-personFree Image from public domain licenseBusiness people handshake clipart, character illustration. Free public domain CC0 image. https://www.rawpixel.com/image/6489631/image-public-domain-blue-womanFree Image from public domain licenseThe iron steam ship "Great Eastern" 22,500 tons: constructed under the direction of I.K. Brunel, F.R.S. -- D.C.L. commanded… https://www.rawpixel.com/image/8648932/image-art-vintage-public-domainFree Image from public domain licenseWall painting: Perseus and Andromeda in landscape, from the imperial villa at Boscotrecase, Roman https://www.rawpixel.com/image/9330842/photo-image-background-hand-artFree Image from public domain licenseAntique print of Japanese, square flag symbol illustration. Public domain image from our own original 1884 edition of The… https://www.rawpixel.com/image/11784281/image-grid-art-patternFree Image from public domain licenseThank you clipart, text illustration vector. Free public domain CC0 image. https://www.rawpixel.com/image/6819260/vector-public-domain-black-illustrationsFree Vector from public domain licenseDesign for a Grate and Surrounding Mantel, Anonymous, British, 19th century https://www.rawpixel.com/image/9328225/design-for-grate-and-surrounding-mantelFree Image from public domain licenseBlad met strooipatroon van stippen en punten (1800 - 1900) by anonymous https://www.rawpixel.com/image/13736179/blad-met-strooipatroon-van-stippen-punten-1800-1900-anonymousFree Image from public domain licenseA small pineapple against the brick wall of a building filled with graffiti.. 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Free public domain CC0 image. https://www.rawpixel.com/image/6489747/vector-sticker-public-domain-blueFree Vector from public domain licenseBeer Street, from Beer Street and Gin LaneThe accompanying poem, not printed in this reissue, reads:Beer, happy Produce of… https://www.rawpixel.com/image/7666060/image-heart-art-vintageFree Image from public domain licenseSaint Hedwig Caring for the Sick; Saint Hedwig Caring for Prisoners https://www.rawpixel.com/image/14245802/saint-hedwig-caring-for-the-sick-saint-hedwig-caring-for-prisonersFree Image from public domain licenseSaint Martin Dividing His Cloak with a Beggar by Lorenzo Lotto https://www.rawpixel.com/image/14247958/saint-martin-dividing-his-cloak-with-beggar-lorenzo-lottoFree Image from public domain licenseAfter a Large Brush Fire Was Extinguished, the Grateful Farmer Handed Out Locally Made German-Style Beer as a Thirst… https://www.rawpixel.com/image/8769769/photo-image-vintage-hand-peopleFree Image from public domain licensePresident of Ukraine met with U.S. Secretary of the Treasury.President of Ukraine Volodymyr Zelenskyy met with U.S.… https://www.rawpixel.com/image/11072849/photo-image-face-hand-peopleFree Image from public domain licenseOntwerp voor een glas in loodraam met twee vogels en ornamenten (in or after 1907 - 1930) by anonymous and t Woonhuys https://www.rawpixel.com/image/13740850/image-grid-art-patternFree Image from public domain licenseA horse, ridden by a fashionably dressed man, baulks at a grating on a city street, breaking a shop window. 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Eight hours of work in a Richmond, California shipyard find these two workers grateful for the… https://www.rawpixel.com/image/12241356/photo-image-face-hand-peopleFree Image from public domain licenseJosephine Bonaparte (née Tascher de la Pagerie), first wife of Napoleon I https://www.rawpixel.com/image/12851068/josephine-bonaparte-nee-tascher-pagerie-first-wife-napoleonFree Image from public domain licenseSheet with overall crisscrossing pattern with large dots https://www.rawpixel.com/image/12491025/sheet-with-overall-crisscrossing-pattern-with-large-dotsFree Image from public domain licenseThis is a composite image of NGC 1068, one of the nearest and brightest galaxies containing a rapidly growing supermassive… https://www.rawpixel.com/image/440810/free-photo-image-hubble-nasa-black-holeFree Image from public domain licenseBlad met strooipatroon van rond en streepjes motief (1750 - 1900) by anonymous https://www.rawpixel.com/image/13752768/blad-met-strooipatroon-van-rond-streepjes-motief-1750-1900-anonymousFree Image from public domain licenseBlad met ruitenpatroon met als veldvulling rozet en overhoekse stippen (1750 - 1900) by anonymous https://www.rawpixel.com/image/13753086/image-background-texture-paperFree Image from public domain licenseBlad met gegaufreerde verticale golvende banen van horizontale streepjes (1800 - 1900) by anonymous https://www.rawpixel.com/image/13753089/image-background-texture-paperFree Image from public domain licenseReproductie van een ontwerp van Richard Roland Holst met een transeptraam voor de Dom te Utrecht (1878 - 1938) by anonymous… https://www.rawpixel.com/image/13780116/image-paper-grid-artFree Image from public domain licenseBlad met regelmatig banenpatroon van strepen en blokjes over kronkelende lijnpatroon van punten (1800 - 1900) by anonymous https://www.rawpixel.com/image/13752808/image-background-texture-paperFree Image from public domain licenseBlad met patroon van vierkantjes (1861 - 1939) by Stampi Remondiniani PESP https://www.rawpixel.com/image/13754632/blad-met-patroon-van-vierkantjes-1861-1939-stampi-remondiniani-pespFree Image from public domain license