Lyric discussion by Floydian42 

Cover art for [The Wall Concept] lyrics by Pink Floyd

But my interpretation(meaning it's not THE answer, just what i think) of The Wall is: All of the negative forces, problems, obstacles, etc. in one's life can be summarized into The Wall. Every brick is every little problem, and they all seem to come together and team up to stop one from what one wants to do/ where one wants to go. It also isolates one from everything/everybody else, almost destroying your sense of expressing feelings and communicating with others.