What "two worlds" are juxtaposed in the opening of Scene I?Comparing and contrasting the two worlds.

In my mind, the two worlds that are brought out in the first
scene are the realities of Blanche and the world.  The setting is important in that Stanley and
Stella live in a working class or poor area of New Orleans.  The industrial, cramped, and tightly
frantic condition of life contrasts with Blanche, who represents a vision of the "Old South." 
She lived on Belle Reve, a plantation with "columns" and where life was different than in the
industrialized vision that Blanche sees in front of her now.  Blanche, herself, might be a world
that is in contrast with what is there.  She is noticeable awkward at this her entrance into this
world, seeking out a drink to calm her nerves.  She is set apart from this environment and is
almost a juxtaposition to it.  Blanche's entrance into the first scene and the awkwardness that
she brings to it helps to add to the disjointed relationship between Blanche and the modern
setting.