You’re not looking at a computer-generated sea of clouds, but rather a rare weather phenomenon that occurs once every few years at the Grand Canyon in Arizona. Visitors looking out from just below the South Rim on Thursday were greeted with a 277-mile sea of fluffiness. It’s officially called a “total cloud inversion”, and is expected to hang inside the canyon throughout Thursday. According to The Weather Service, the fog is able to hang around and build up in the Grand Canyon overnight when there is no wind. Click here to view the first image in today’s viral picture gallery. Continue reading for a viral video of a real-life Spider-Man who just set a new climbing record.