The theme that is found in both "We Wear the Mask" and "A Man Said to the Universe" is: Each person is one small part of a vast and unforgiving ecosystem.
In the poem, "A Man Said to the Universe," the speaker calls out to the universe to tell it that he exists. The universe responds by a high sense of indifference and callousness.
In "We Wear the Mask," the speaker explains how we must wear a mask of happiness even though we might be hurting internally.
Both of these poems show that we are all a small part of a vast and unforgiving universe.
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