I highly recommend to peruse the case study published in The International Gestalt Journal by FABIENNE KUENZLI, PhD.
Throughout the text the author intertwines three narratives: what client says, the inner dialogue of the therapist, and the narration from the book ‘The Little Prince’ by Antoine de Saint-Exupéry
I found it enormously intriguing and rich both in content and form regarding how therapy may serve the client using the famous literary text with a therapeutic approach.