symbols relating to blanche
s5: split coke on her dress= recalls the blood spilt by allan's suicide OR perhaps blanche's stained reputation
baths= her endless desire to be cleansed of her guilt for her husband's death and of her promiscuous past, e.g. Macbeth
light/ paper lantern= longing for 'magic'= the disguising of ugly reality
when stanley tears off the lantern blanche cries out in pain= emotional pain so great it translates into physical suffering
light also references the idea of moths= image used of blanche's fragility in s1