C.S. Lewis, in "The Voyage of the Dawn Treader," suggests that many people harbor a hidden, often imaginary world. This concept reflects the idea that everyone has desires and dreams that they may not openly express or may only explore in their minds. Such personal landscapes can serve as an escape or a source of inspiration, even if they don't manifest in reality.
Edmund and Lucy, characters in the story, are fortunate because they have experienced adventures in a real magical realm. This allows them to transcend ordinary existence, representing the distinction between those who merely dream and those who actively explore their fantasies. Their journeys serve as a reminder of the richness that real adventures can bring to life.