>O2 > rare clouds on Planet Earth (photos) Posted on 30am00k by o2task > Clouds fill the skies above us and are part of our every day lives, often going unnoticed. However, there are some clouds that are so rare that you will be very lucky to see them in your lifetime. Related articles the songs of clouds (gatheringofsouls.wordpress.com) Physicists create clouds of impenetrable gases that bounce off each other (physorg.com) Let Us Journey To The Clouds (manacled.wordpress.com) What is the name of flat clouds (wiki.answers.com)