Visual balance in children's books refers to the arrangement of illustrations, text, and white space to create a pleasing and cohesive look. This balance can be symmetrical, where elements are evenly distributed on either side, or asymmetrical, which involves a more dynamic arrangement that still appears balanced. Effective visual balance directs the reader's eye, enhances storytelling, and contributes to the overall mood of the book, ensuring that both children and adults engage fully with the narrative and illustrations.