Black Pool

Of all the grand sights at Yellowstone National Park, one of my favorite photographs from there has turned out to be this close-up, abstract shot of Black Pool in the West Thumb Geyser Basin. As you can see, the pool is now blue, not black. A temperature change in 1991 killed off the bacteria that gave the pool is darker hue, and now it’s a brilliant azure. This brings out great textures in the water.