Quoins are masonry blocks at the corner of a wall. They exist in some cases to provide actual strength for a wall made with inferior stone or rubble, and in other cases to make a feature of a corner, creating an impression of permanence and strength, and reinforcing the onlooker's sense of a structure's presence.
Stone quoins are used on stone or brick buildings.
In one common form of decorative use, quoins wrap around the wall with their longest sides oriented horizontally, first left, then right around the corner.
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