Fountains are gorgeous to the eyes and ears…and in my case, the eyes-in-ears. They’re often green, but in the case of the Mercury Fountain in the rotunda of the National Gallery of Art, the falling water is blue. The acoustical situation of the rotunda is gorgeous – big, hollow, and soothing. People are always chatting, but in the hushed tones usually kept for cathedrals. Their voices rise burgundy above the splashing, blue fountain noise.