Answer:
Roger Waters wrote this song about his views on formal education, which were framed during his time at the Cambridgeshire School for Boys. He hated his grammar school teachers and felt they were more interested in keeping the kids quiet than teaching them. The wall refers to the emotional barrier Waters built around himself because he wasn't in touch with reality. The bricks in the wall were the events in his life which propelled him to build this proverbial wall around him, and his school teacher was another brick in the wall.
Waters told Mojo, December 2009, that the song is meant to be satirical. He explained: "You couldn't find anybody in the world more pro-education than me. But the education I went through in boys' grammar school in the '50s was very controlling and demanded rebellion. The teachers were weak and therefore easy targets. The song is meant to be a rebellion against errant government, against people who have power over you, who are wrong. Then it absolutely demanded that you rebel against that."
Step-by-step explanation: