Recalling the first Trinity nuclear blast, which is being memorialized by the new Christopher Nolan film “Oppenheimer,” I couldn’t help thinking of the last collage that Norman O. Mustill made and his first using digital tools. He pixilated an infamous Abu Ghraib image, added a crucifix made of what look like bones, and combined it with a photo of the ancient skull of an Aztec sacrificial victim on exhibit at the Museo Nacional de Anthropolgia in Mexico City. He made two numbered originals. Since I took the skull photo, he sent me #2.