Massive congregations of greenish phytoplankton swirl in the dark water around Gotland, a Swedish island in the Baltic Sea.… https://www.rawpixel.com/image/440200/free-photo-image-van-gogh-nasa-mapsFree Image from public domain licenseRocks on beach, Gotland, Sweden. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3296764/free-photo-image-rocks-texture-white-pebbles-pngFree Image from public domain license