Final answer:
In a play, central ideas interact through the structure of the narrative and are expressed through themes, character interactions, and stage directions, all contributing to the development of the play's message.
Step-by-step explanation:
The central ideas in a play often interact and evolve through the narrative structure, from the inciting incident to the climax, and ultimately to the resolution. Plays like Romeo and Juliet explore themes of love and family conflict, where the protagonists' desire to be together is challenged by external forces, leading to tragedy.
Similarly, the interplay of ideas such as loyalty, duty, and religious beliefs are examined in plays like Antigone, where the protagonist's moral obligation to her brother conflicts with the king's edict.
The playwright's intentions, the actors' portrayal, and elements like stage directions, set design, and costume contribute significantly to the interaction of central ideas, emphasizing key moments and shifts in the narrative, and adding layers of meaning to the play's message.