"you musnt try build a wall" part 3- The metaphor is very sophisticated and demonstrates how Sheila has matured as a character. Sheila begins to echo the Inspector's dialogue and attempts to translate it into a language that her family will understand, however she is dismissed as hysterical. She begins to adopt the Inspector's structure of speech. Initially, when questioning her he laid out what she did and then the consequences, now here, Sheila is demonstrating what the family and doing and then the possible amplified consequences of their actions.