Blonde Girl Wearing Black Stockings Outside At The Wall

In culture a wall normally means a barrier stopping progress or entry. For instance the progressive / psychedelic rock band Pink Floyd have a concept album called The Wall. This Wall is not real, but a metaphor for social barring. American poet laureate Robert Frost describes a pointless rock wall as a metaphor for the myopia of the culture-bound in his poem Mending Wall. The Berlin Wall that separated the Soviet zone of Berlin, Germany from the rest of the city from 1961 until its ultimate destruction in 1989 was often referred to just as 'The Wall'.
In some cases, a wall may refer to an individual's debilitating mental or physical condition, seen as an impassable barrier.
Another common usage is as a communal surface to write upon. For instance the social networking site Facebook uses a wall to log the scrawls of friends. Users have gone on to create more advanced versions of the original wall, such as the application SuperWall.