"The twentieth century was a time of rapid globalization for advanced art. Artists from a larger number of countries made important contributions than in earlier periods, and they did so in a larger number of places. Many important innovations also diffused more rapidly, and more widely, than in...

"Scholars of literature have devoted considerable attention to what they have called confessional or personal poetry, in which Robert Lowell, Sylvia Plath, and a series of other poets, from the 1950s on, made their art out of the experiences of their own lives. Yet art scholars have not analyzed...