Hugo von Hofmannsthal is one of the modern era's most important writers, but his fame as Richard Strauss's pioneering collaborator on such operas as Der Rosenkavalier and Die Frau ohne Schatten has obscured his other remarkable writings: his precocious lyric poetry, inventive short fiction, keen essays, and visionary plays. The Whole Difference, which includes new translations as well as classic ones long out of print, is a...