It is often a freestanding open structure which is hexagonal or octagonal in shape. While there are other designs too, but these two are most common, along with a built-in seating such as benches. They provide you a sheltered area within your garden and you can enhance the privacy by adding some drapes or curtains to it. Also, they can serve you as a focal point that can add to overall appeal of your garden or you can incorporate it at a point from where you can have a clear view of the house and what is going on around.