1, similar books are put together, and books can be arranged from high to low, which is beautiful.
2. If space is limited, books with low reading frequency can be placed flat, books that are often read can be placed on it, and books with extremely large size and height can also be placed flat.
3. It is best to use a book stand for each book. On the one hand, it ensures that it will not fall, on the other hand, it helps to classify.