Not all shelving is meant to be designed as corner shelving. It would be impractical for a book case to be made in the corner shelving design, because there would be valuable shelf space that could not be used to store books because of the angle of the back side of the shelves. A china cabinet or hutch would pose the same design problem.
Corner shelves have become all the rage now a days in today's modern designs. Although they are hugely popular today, they have been around for over a hundred years. Way back in the day, people needed that little but of extra storage in every room in their house. Most of the storage was taken care of by cabinets and cupboards, but these did not give anyone a place to display any of their collectibles.
For displays that consist of at least 3 book cases side by side, choose one or two shelves that will hold one large object each. Fill a shelf with a large ivy like plant... or a decorative dish.
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