What do the opening stage directions indicate about the playwright's style and dramatic technique?

At first, the stage directions convey a lot of detail about the setting, for instance this rundown quarter of New Orleans is ironically named ‘Elysian fields’, yet Blanche discovers it does not match her expectation of a paradise, foreshadowing a tragedy. In fact, instead of being a place of eternal rest, the ‘Elysian fields’ is a multi-cultural, vibrant and sensual place with the ‘blue piano’, evoking sexual tension.  One of her first acknowledgement to the setting is disorientation and confusion, as she cannot believe where she has just arrived, repeating ‘Elysian field’ in disbelief, which also emphasizes how at odds with this place the protagonist is. The way he depicts the opening scene also helps create a powerful contrast between Blanche and her surroundings. At this time, social distinctions were ignored. Therefore, black people where having relationships with whites, and members with different ethnic groups played poker as well as bowled together. As Blanche arrives at Stella’s apartment, she immediately becomes the antagonist of the setting. Moreover well a claustrophobic sense develops through Blanche’s reaction to the place. The confined setting of two-room apartment creates an oppressive heat, and hence, Blanche feels overwhelmed. Her incredulous questions to her sister about the apartment immediately cause tension between the two characters and there’s a sense of blanche has walked into a cage, which is the opposite of her expectation.