Diego Rivera, the Western Hemisphere's greatest living painter, is working on a mural that will be half under water. Last week, at 64, the frog-shaped Master was completing his work in a Mexico City tank that looks like an empty swimming pool; actually, it is the distribution chamber of a new water-supply system for Mexico City.
One surprising thing about the mural, for Rivera, is its consistent planning; he began it by picturing a drop of water in the center of the floor, showed underwater forms of life evolving out and up from the center. Along the walls are people and symbols...