Internal view of the O'Neill cylinder (2015) painting by Don Davis. Original public domain image from Wikimedia Commons.… https://www.rawpixel.com/image/10184805/image-cloud-sunsets-shadowFree Image from public domain licenseMount Snowdon through Clearing Clouds by Alfred William Hunt https://www.rawpixel.com/image/14263278/mount-snowdon-through-clearing-clouds-alfred-william-huntFree Image from public domain licenseThe Glorification of the Union of the Houses of Hapsburg and Lorraine by Franz Anton Maulbertsch https://www.rawpixel.com/image/14262895/image-clouds-angels-handsFree Image from public domain licenseTwo Dragons in Clouds (1885), vintage Japanese dragon illustration by Kanō Hōgai. Original public domain image from… https://www.rawpixel.com/image/11063957/image-clouds-art-vintageFree Image from public domain licenseElements of astronomy (1875) chromolithograph art by Sir Norman Lockyer. Original public domain image from Wikimedia… https://www.rawpixel.com/image/10184725/image-cloud-galaxy-faceFree Image from public domain licenseThe elements of astronomy; a textbook (1919) chromolithograph art by Charles Augustus. Original public domain image from… https://www.rawpixel.com/image/10184816/image-cloud-moon-spaceFree Image from public domain licenseThe Resurrection, from Cabinet Reynst by Cornelis Visscher https://www.rawpixel.com/image/8981237/the-resurrection-from-cabinet-reynst-cornelis-visscherFree Image from public domain licenseHeavy Lift Launch Vehicle Concept (2004), vintage illustration. Original public domain image from Wikimedia Commons. … https://www.rawpixel.com/image/11065533/image-cloud-art-vintageFree Image from public domain licenseHebe with Jupiter in the Guise of an Eagle (1820 - 1826) by Gustav Adolphe Diez https://www.rawpixel.com/image/13734608/hebe-with-jupiter-the-guise-eagle-1820-1826-gustav-adolphe-diezFree Image from public domain licenseA hydrogen balloon flying high above the clouds with the sun shining on it. Coloured wood engraving. https://www.rawpixel.com/image/13969774/image-cloud-sunset-artFree Image from public domain licenseThe view from a balloon on a flight over southern England in 1881. Coloured wood engraving after W.B. Murray, 1881. https://www.rawpixel.com/image/13969535/image-background-paper-cloudFree Image from public domain licenseGeography: Niagara Falls, seen from nearby. Coloured lithograph. https://www.rawpixel.com/image/13970182/geography-niagara-falls-seen-from-nearby-coloured-lithographFree Image from public domain licenseFaith (1781) engraving art by George Siegmund Facius. Original public domain image from Yale Center for British Art.… https://www.rawpixel.com/image/11493479/image-cloud-person-artFree Image from public domain licenseA line of hot-air balloons loaded with boxes advertise "A. Stevens" as they travel over a line of sailing ships. Wood… https://www.rawpixel.com/image/13970304/image-paper-cloud-cartoonFree Image from public domain licenseAstronomy: various apocalyptic scenes, including riot, war, and shipwreck. Coloured lithograph, [c.1832]. https://www.rawpixel.com/image/13959554/image-cloud-horse-cartoonFree Image from public domain licenseA long-eared bat flying over a churchyard. Coloured wood engraving by J. W. Whimper. https://www.rawpixel.com/image/13970118/image-paper-cloud-cartoonFree Image from public domain licenseSaint Ignatius of Loyola's Vision of Christ and God the Father at La Storta by Domenichino Zampieri https://www.rawpixel.com/image/11922747/image-cloud-person-artFree Image from public domain licenseSix nocturnal mammals of the order Chiroptera. Line engraving by Milton after S. Edwards. https://www.rawpixel.com/image/13961449/image-paper-cloud-cartoonFree Image from public domain licenseMount Vesuvius erupting at night, billowing clouds and flashes of lightning, and with many spectators viewing the event… https://www.rawpixel.com/image/13958662/image-clouds-person-artFree Image from public domain licenseGeology: various geological phenomena. Coloured engraving by J. Emslie, 1852, after himself. https://www.rawpixel.com/image/13957715/image-cloud-person-bookFree Image from public domain licensePrincess Charlotte Augusta, holding her deceased child, ascending to heaven after her death in childbirth. Mezzotint, ca.… https://www.rawpixel.com/image/13958956/image-cloud-angel-personFree Image from public domain licenseOntwerp voor een plafondschildering met putti, bloemen en guirlandes (1677 - 1755) by Elias van Nijmegen https://www.rawpixel.com/image/13736691/image-paper-cloud-faceFree Image from public domain licenseOntwerp voor een plafondschildering met gezicht in de hemel waar Aurora Duisternis verdrijft (1715 - 1798) by Dionys van… https://www.rawpixel.com/image/13736413/image-paper-face-frameFree Image from public domain licenseVulkaan Guntur te West-Java (1854) by Frans Wilhelm Junghuhn, Frans Wilhelm Junghuhn and Koninklijke Nederlandse… https://www.rawpixel.com/image/13735082/image-paper-cloud-frameFree Image from public domain licenseOntwerp voor een plafondschildering met musicerende vrouwen op wolken (1715 - 1798) by Dionys van Nijmegen https://www.rawpixel.com/image/13736396/image-paper-cloud-cartoonFree Image from public domain licenseBinnenzijde van krater Etna (1778) by Willem Carel Dierkens https://www.rawpixel.com/image/13737436/binnenzijde-van-krater-etna-1778-willem-carel-dierkensFree Image from public domain licenseDesign for a Ceiling Painting with a Nuptial Allegory (c. 1750 - c. 1775) by Pietro Antonio III Novelli and Jacopo Guarana https://www.rawpixel.com/image/13736404/image-paper-cloud-cartoonFree Image from public domain licenseThe Eye, Like a Strange Balloon Moves Towards Infinity, plate one from To Edgar Poe by Odilon Redon https://www.rawpixel.com/image/8970508/image-paper-cloud-moonFree Image from public domain licenseThe Fifth Plague of Egypt, plate 16 from LIber Studiorum by Joseph Mallord William Turner https://www.rawpixel.com/image/8982715/image-paper-cloud-frameFree Image from public domain licenseNorham Castle, plate 57 from Liber Studiorum by Joseph Mallord William Turner https://www.rawpixel.com/image/8990260/norham-castle-plate-from-liber-studiorum-joseph-mallord-william-turnerFree Image from public domain licenseTomb of Horath, plate six from the Ruins of Rome by M. Dubourg https://www.rawpixel.com/image/8998086/tomb-horath-plate-six-from-the-ruins-rome-dubourgFree Image from public domain licenseJanus's Arch, plate twenty from the Ruins of Rome by M. Dubourg https://www.rawpixel.com/image/8997886/januss-arch-plate-twenty-from-the-ruins-rome-dubourgFree Image from public domain licenseDoctor Syntax Tumbling in the Water, from The Tour of Doctor Syntax by Thomas Rowlandson https://www.rawpixel.com/image/8990473/image-paper-cloud-cowFree Image from public domain licenseThe Alps, from Various Landscape Sites by Alexandre Calame https://www.rawpixel.com/image/8982941/the-alps-from-various-landscape-sites-alexandre-calameFree Image from public domain licenseInverary Castle and Town, plate 65 from Liber Studiorum by Joseph Mallord William Turner https://www.rawpixel.com/image/8987944/image-paper-cloud-frameFree Image from public domain licensePonte Nomentano, plate twenty-seven from Ruins of Rome by M. Dubourg https://www.rawpixel.com/image/8998573/ponte-nomentano-plate-twenty-seven-from-ruins-rome-dubourgFree Image from public domain licenseThe Mildmay Sea-Piece, plate 40 from Liber Studiorum by Joseph Mallord William Turner https://www.rawpixel.com/image/8985153/image-paper-cloud-sunsetFree Image from public domain licenseMartello Towers near Bexhill, Sussex by Joseph Mallord William Turner https://www.rawpixel.com/image/8988470/martello-towers-near-bexhill-sussex-joseph-mallord-william-turnerFree Image from public domain licenseView above the Falls of Schuylkill, plate three of the first number of Picturesque Views of American Scenery by John Hill https://www.rawpixel.com/image/8982982/image-paper-cloud-plantFree Image from public domain licenseBrimham Rocks, near Pateley Bridge Yorkshire by Francis Nicholson https://www.rawpixel.com/image/8991747/brimham-rocks-near-pateley-bridge-yorkshire-francis-nicholsonFree Image from public domain licenseBen Arthur, plate 69 from Liber Studiorum by Joseph Mallord William Turner https://www.rawpixel.com/image/8977533/ben-arthur-plate-from-liber-studiorum-joseph-mallord-william-turnerFree Image from public domain licenseReturn to Port, plate two from Six Marines by Eugène Isabey https://www.rawpixel.com/image/8985694/return-port-plate-two-from-six-marines-eugene-isabeyFree Image from public domain licenseLake of Uri and Brunnen, from Picturesque Selections by James Duffield Harding https://www.rawpixel.com/image/9023364/lake-uri-and-brunnen-from-picturesque-selections-james-duffield-hardingFree Image from public domain licenseMartello Towers Near Bexhill, Sussex, plate 34 from Liber Studiorum by Joseph Mallord William Turner https://www.rawpixel.com/image/8990333/image-paper-cloud-frameFree Image from public domain licenseEntrance of Calais Harbour, plate 55 from Liber Studiorum by Joseph Mallord William Turner https://www.rawpixel.com/image/8983042/image-paper-cloud-frameFree Image from public domain licenseTemple of Venus and Cupid, plate twelve from the Ruins of Rome by M. Dubourg https://www.rawpixel.com/image/8985508/temple-venus-and-cupid-plate-twelve-from-the-ruins-rome-dubourgFree Image from public domain licenseSt. Agnes's Church, plate eight from the Ruins of Rome by M. Dubourg https://www.rawpixel.com/image/8998474/st-agness-church-plate-eight-from-the-ruins-rome-dubourgFree Image from public domain licenseTemple of Hope, plate twenty-four from the Ruins of Rome by M. Dubourg https://www.rawpixel.com/image/8996804/temple-hope-plate-twenty-four-from-the-ruins-rome-dubourgFree Image from public domain licenseThe Apocalypse: the opening of the sixth seal. Mezzotint by G.H. Phillips, 1844, after F. Danby. https://www.rawpixel.com/image/13958932/image-cloud-person-artFree Image from public domain licenseRiver View by Moonlight (in or after c. 1653) by Aert van der Neer https://www.rawpixel.com/image/13742091/river-view-moonlight-in-after-1653-aert-van-der-neerFree Image from public domain licenseCloud shadows from Hopi Point, Grand Canyon National Park, Arizona (c. 1928) by anonymous https://www.rawpixel.com/image/13735927/image-paper-cloud-shadowFree Image from public domain licenseAstronomy: Mercury with his caduceus, in his chariot, drawn by cockerels. Engraving by C. Lasinio after Raphael, 1516. https://www.rawpixel.com/image/13968505/image-cloud-cat-cartoonFree Image from public domain licenseWalled city with lone horseman, Afghanistan. Watercolour. https://www.rawpixel.com/image/13962497/walled-city-with-lone-horseman-afghanistan-watercolourFree Image from public domain licenseThe Christ Child of S. Maria in Aracoeli in Rome. Etching by C. Nolli after A. Masucci. https://www.rawpixel.com/image/13957548/image-cloud-cartoon-faceFree Image from public domain licenseNarrative of the surveying voyages of His Majesty's ships Adventure and Beagle, between the years 1826 and 1836, describing… https://www.rawpixel.com/image/13965400/image-cloud-horse-personFree Image from public domain licenseMount Vesuvius erupting in 1755, seen from the west, with two small views of the volcano in 1631, and of the volcano's… https://www.rawpixel.com/image/13968130/image-cloud-person-artFree Image from public domain licenseAstronomy: Jupiter in his chariot, drawn by a pair of eagles. Engraving by C. Lasinio after Raphael, 1516. https://www.rawpixel.com/image/13970584/image-cloud-cartoon-personFree Image from public domain licenseThe Virgin and Christ Child 'Nuestra Senora de la Caveza' at Zujar. Engraving by H. V. Ugarte, 1759. https://www.rawpixel.com/image/13965726/image-paper-cloud-cartoonFree Image from public domain licenseThe Royal Botanic Society. Sketch of proposed additions to large conservatory. https://www.rawpixel.com/image/13965570/the-royal-botanic-society-sketch-proposed-additions-large-conservatoryFree Image from public domain license