What is the significance of the novel's title, All the Bright Places?

Finch and Violet read Dr Suess’ book “Oh The Places You’ll Go” together early one morning when they visit the bookstore at which his mother works. The title for the novel “All the Bright Places” comes from this book. The two often sing the phrases of the book to one another. The book, with its theme of travel, correlates with Violet and Finch’s wanderings.