A STREETCAR NAMED DESIRE - TENNESSEE WILLIAMS

This is a link to an article on "Plastic Theatre" - a term coined by Williams in his preface to "The Glass Menagerie", his first play.  It means the use of theatrical devices - such as sound, props, imagery, setting - to convey the psychology of the characters.

https://streetcarnameddesire.wikispaces.com/Plastic+Theatre

Some examples are given.  I suggest you go through the play reviewing these and adding other examples as you find them.  This is a crucial in discussing how Williams "presents" his themes.