Lyric discussion by quagmire 

Cover art for Another Brick in the Wall, Pt. 3 lyrics by Pink Floyd

At this point in the film Pink has put so many bricks into his wall of isolation, he has completed it and has effectivly alienated himself from everyone else. The phrase writing on the wall was first used in the bible and means foreseeing the future, meaning that Pink knows how screwed over he is but doesn't try to help himself, or can't helf himself.

That's exactly explained (I lived it and the song also describes it perfectly, as stupid as it is).

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