Walls are built for two reasons; to either keep things in or to keep things out. Because of this walls can can symbolize isolation, depression, or stubbornness. If someone is keeping things from other people they are often said to be keeping their walls up. Maybe it’s for their own protection, or maybe it is for the protection of others. Walls can also be used to symbolize defense because they have often been used as defensive structures in the past.
A wall can be built brick by brick and that wall is made up of each individual bricks. Because of this walls also have a less negative and aggressive meaning. Walls can represent a group of individuals who make up a whole, as well as teamwork, friendship, and family.