Why does Eleanor Farjeon call each book 'a magic box'?

Books are called 'a magic box' because they are full of stories, knowledge, and imagination that can transport the reader to different worlds and experiences.

Eleanor Farjeon metaphorically refers to each book as 'a magic box' in her poem to highlight the immense power and wonder contained within them. When a book is opened, it reveals a treasury of narratives, facts, and ideas, akin to a magic box unveiling its hidden treasures. Books have the unique ability to ignite a reader's imagination, allowing them to journey through various times and places, meet diverse characters, and gain new perspectives without physically moving. This transformative power of books to enchant, educate, and transport is why the poet aptly labels them 'magic boxes'.