in "the wall" - the movie - every incident in "pink's" life becomes another brick in the wall he's created. he is slowly learning to block out everyone. this song is describing the school he went to, and how they forced the children into submission and made them conform to this standard. he is claiming, in the song, that the treatment of the school to him is just another brick in that wall he created, just another thing to help isolate him more and more.
in "the wall" - the movie - every incident in "pink's" life becomes another brick in the wall he's created. he is slowly learning to block out everyone. this song is describing the school he went to, and how they forced the children into submission and made them conform to this standard. he is claiming, in the song, that the treatment of the school to him is just another brick in that wall he created, just another thing to help isolate him more and more.