The theme of the poem is that our attempts to have grand experiences in life can be frustrated.
The theme of a poem refers to the message the author wants to convey through reading the poem. This theme can only be perceived by interpreting the poem.
In the case of "You've seen balloons set, haven't you?" we can see the theme because:
With this, we can perceive that the theme of the poem states that successful and admirable journeys can face moments of failure.
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