The nuanced mysteries of light, darkness, presence, and memory are central themes in W.S. Merwin’s new book of poems. “I have only what I remember,” Merwin admits, and his memories are focused and profound—the distinct qualities of autumn light, a conversation with a boyhood teacher, well-cultivated loves, and “our long evenings and astonishment.” In “Photographer,” Merwin presents the scene where armloads of antique glass negatives are saved from a dumpcart by “someone who understood.” In “Empty Lot,” Merwin evokes a child lying in bed at night, listening to the muffled dynamite blasts of coal mining near his home, and we can’t help but ask: How shall we mine our lives? somewhere the Perseids are fallingtoward us already at a speed that wouldburn us alive if we could believe itbut in the stillness after the rain endsnothing is to be heard but the drops falling