Instantly recognizable images dominate “America’s Cool Modernism: O’Keeffe to Hopper,” the surprisingly arresting new show at the Ashmolean Museum in Oxford: Charles Demuth’s magnetic I Saw the Figure Five in Gold (1928), inspired by his friend William Carlos Williams’s poem The Great Figure, in which a fire truck speeds through the streets of New York one rainy night; Georgia O’Keeffe’s breathtakingly chilly East River from the… [read post]