Which children's book series pioneered the 'experiential retail' concept with dedicated in-store sections featuring interactive activities and merchandise displays before expanding to standalone themed stores?

The worlds of literature and consumer products have often intersected in fascinating ways. Throughout history, beloved literary characters and works have been transformed into iconic branded merchandise and experiences. This trivia question explores how a classic children's book series evolved into a global retail phenomenon with innovative experiential marketing that changed how literary properties are commercialized.

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

Harry Potter (with platform 9¾ experiences and themed areas in bookstores)
Chronicles of Narnia (with wardrobe entryways and snow rooms)
Dr. Seuss (with Whoville villages and character interaction zones)
Percy Jackson (with Camp Half-Blood training areas and mythology zones)