tragedy, with blanche as the tragic heroine
antagonism between blanche and stanley has sexual undertones= for stanley blanches tragic downfall is a triumph of his sexuality
for blanche it is the ultimate breaking-up of her dream world, which will wreck her sanity
by focusing on blanche, like other playwrights (e.g. Webster's 'The Duchess of Malfi' centers on the Duchess), Williams disregards the artificiality of the unity of time an adopts the unities of place and action= makes the play seem more realistic= allows Williams to more closely reflect the real world