Why does Blanche shrink away at the sound of the vendor in A Streetcar Named Desire?

In "A Streetcar Named Desire," Blanche DuBois shrinks away at the sound of the vendor because it symbolizes the harsh realities of life that she cannot escape. The vendor's call is a reminder of her deteriorating mental state and the loss of her former gentility. It disrupts her fragile world of illusion and reveals her vulnerability, highlighting her struggle between reality and her desire to cling to the past. This moment underscores her increasing alienation and desperation in a world that feels threatening and unfamiliar.