In "Surprise Island" by Gertrude Chandler Warner, the characters Jessie, Violet, and Henry come across three different books, each related to nature: one about butterflies, another about shells, and the last about flowers. Their excitement grows as they realize that these books likely form a complete set, which suggests a deeper exploration of the natural world.
The discovery of these themed books highlights the children's curiosity and shared interest in nature. This moment underscores the joys of learning and discovery that the series emphasizes, as the children connect with the themes and possibly embark on further adventures influenced by these materials.