Taking its title from Derek Walcott's line, 'The perpetual ideal is astonishment', Anne Stevenson's 16th collection of poems looks back over eighty years of the earth's never-ceasing turbulence, setting clearly remembered scenes from her personal past against a background of geographical and historical change. As always, her chief preoccupation is with the extraordinary nature of experience itself, and this she explores as a geologist might explore the rock layers beneath an urban surface relied upon by the senses, yet in the perspective of deep time acknowledged to be temporary and passing. As a poet who has always been anxious to balance imagination with insight and for whom the sound and shape of every poem is integral to its meaning, Stevenson views contemporary scientific and technological advance with a sceptic's compassion for its ecological and human cost. While in some poems she acknowledges her debt to writers such as Henry David Thoreau and Henry James, she carefully points out ways in which they anticipated the collapse of the world they valued. In others she demonstrates that a belief in scientific method and Darwinian evolution is in every way compatible with a sense of the sacred in the living world. Always what is most astonishing to her is that life exists at all, that the normal is also and amazingly the phenomenal. And although notes of poignant sadness, together with some witty assaults on human folly are sounded throughout this collection, its predominant tone is one of celebration.