A book nook or a bookshelf insert is a miniature diorama designed to fit between books on a shelf. They often depict a form of a street or similar setting in a theme from famous books. Book nook can also make a form of a 3D model. From Wikipedia
Priced at $129.99, the 1,201-piece set is Lego’s most affordable Lord of the Rings model in its new Book Nook series featuring Harry Potter and Sherlock Holmes.