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Wikipedia: A wall is a usually solid structure that defines and sometimes protects an area. Most commonly, a wall delineates a building and supports its superstructure, separates space in buildings into rooms, or protects or delineates a space in the open air. There are three principal types of structural walls: building walls, exterior boundary walls, and retaining walls.
![[Dry-stone wall - Grendon]](http://images.ookaboo.com/photo/s/Dry_Stone_Wall_Blackmile_Lane_2C_Grendon_2C_Northamptonshire_s.jpg "Dry-stone wall - Grendon")
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![[Dry-stone wall - Grendon]](http://images.ookaboo.com/photo/s/P5230470_s.jpg "Dry-stone wall - Grendon")
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 from Brookie |
from Brookie |
![[An ancient Roman aqueduct in a 'Villa' garden.]](http://images.ookaboo.com/photo/s/Olditalianwall_s.jpg "An ancient Roman aqueduct in a 'Villa' garden.")
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![[Stone wall of an English barn]](http://images.ookaboo.com/photo/s/Stone_wall_s.jpg "Stone wall of an English barn")
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 from Redmarkviolinist |
 from Nk |
![[A brick wall]](http://images.ookaboo.com/photo/s/Brick_wall_old_s.jpg "A brick wall")
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from Man vyi |
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