This sculptural white puffy cloud stands alone creating light and shadow in a perfectly blue sky. https://www.rawpixel.com/image/5975324/photo-image-background-cloud-public-domainFree Image from public domain licenseCrocodylidae in São Paulo Zoo. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3340672/free-photo-image-alligator-animal-cc0Free Image from public domain licenseGlacier cave at Pitztall in Austria. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3371551/free-photo-image-cave-cc0-creative-commonsFree Image from public domain licenseElizabeth Gray Otis (Mrs. Samuel Alleyne Otis), (ca. 1764) by John Singleton Copley. https://www.rawpixel.com/image/8230669/image-art-vintage-public-domainFree Image from public domain licensePortrait of a Member of the Haarlem Civic Guard (ca. 1636–1638) by Frans Hal. https://www.rawpixel.com/image/8229859/image-art-vintage-public-domainFree Image from public domain licenseA close-up of the spinning surface of a vinyl record. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3303924/free-photo-image-camera-lens-cc0-creative-commonsFree Image from public domain licenseWilson Arch near La Sal in San Juan county, Utah, USA. (The author's description on the source web page incorrectly gives… https://www.rawpixel.com/image/3338627/free-photo-image-archaeology-cc0-cliffFree Image from public domain licenseSessiz kuÄŸu (Cygnus olor). Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3340582/free-photo-image-animal-bird-cc0Free Image from public domain licenseMacro shot of plant branches with opposite serrated leaves in a dark environment. Original public domain image from… https://www.rawpixel.com/image/3294952/free-photo-image-cc0-creative-commonsFree Image from public domain licenseSiberian Chipmunk photographed on the mountain, South Korea (Seoraksan). Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3340521/free-photo-image-2005-09-04utc-animal-cc0Free Image from public domain licenseWoman in a swimsuit dives off a lake pier into the water. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3301543/free-photo-image-diving-cc0-creative-commonsFree Image from public domain licenseCaminata en ca?das de aguas escondidas en Algarrobo, V Regi?n, Chile. Original image from Wikimedia Commons https://www.rawpixel.com/image/3370887/free-photo-image-cc0-cliff-creative-commonsFree Image from public domain license