This is essentially a showcase of a lifetime of Annie Dillard's work - it's an anthology of previously published essays, selected from her 8 non-fiction books, arranged in chronological order. She's mostly known for a particular kind of observational writing, she is almost uniquely able to illuminate ordinary moments, or ordinary objects, and transform them through precise and meditative language into something extraordinary.
She's especially strong on observations of the natural world, eclipses, moths and birds, but also herself, her emotions and experiences.
This is a very good sampler of her work, even for those who have read some of her previous books. It's a lovely hardback edition, and she warrants re-reading.