The two details from "The Lighted Window" that develop the theme are:
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Once more these things were treasures - This line highlights the nostalgic and innocent perception of childhood, emphasizing a longing for simpler times and the value placed on childhood treasures.
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Thinking of all my problems that never are solved. - This line sets the tone of the adult's perspective, contrasting the burdens of adulthood with the carefree desires of childhood, thereby deepening the theme of loss and the passage of time.
These details contribute to the exploration of memory, nostalgia, and the contrast between childhood and adulthood in the poem.