Billion-volt atomic particles in Brookhaven Cosmotron, c. 1957. Original public domain image from Flickr https://www.rawpixel.com/image/3322421/free-photo-image-black-and-white-macroFree Image from public domain licenseGray digital wallpaper. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3305670/free-photo-image-texture-pattern-wallpaperFree Image from public domain licenseMonochrome design Messeplatz. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3282428/free-photo-image-architecture-abstract-geometricFree Image from public domain licenseWater droplet. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3283477/free-photo-image-bubble-cc0-creative-commonsFree Image from public domain licenseAn undulating surface with a pattern of gray circles on a black texture. 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