The older corner type shelves used to have a decorative wood or metal bracket that would be visible. Although it was easily seen, it was made to blend into the decor of the room. With the modern corner shelves, they can be hung with out any of the brackets being seen. You can still get a large number with decorative wall brackets, but a floating type design has become so much more popular.
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.
Always check that the slider mechanism is working properly. A piece of advice, sliding doors are more fancy but can be a headache if they don't work well.
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