The bookcases contain clever L-shaped shelves which can be reversed. One side of the shelf is less deep which enables you to showcase paperback fiction and chapter books, flip the shelf onto the deeper setting and it’s perfect for non-fiction and picturebooks. This ensures the books always look at their best and the smaller books don’t disappear into the shadows at the back of the bookcase. The units are on high quality castors making them easy to move when you want to make space for storytime and class activities. Plus you can keep the library fresh by changing the whole layout without having to buy anything new.