The line "The only way out is back" from the poem "Edge" contains an allusion to the myth of Icarus and Daedalus.
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The allusion in Abel's Bride poem refers to the biblical story of Cain and Abel from the Book of Genesis. The poem uses this allusion to explore themes of jealousy, betrayal, and violence in a romantic context.
An allusion is a reference to a well know person, place, thing, work of art, piece of literature, etc. An allusion poem might contain one reference, several references, or simply be one big reference itself.
The last line of a haiku poem typically contains five syllables.
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In the fifth stanza of the poem, the speaker speaks of "[his] sorrow must be laid/On your head like a crown." This is a direct allusion to Jesus Christ's crown of thorns which he wore during his crucifixion. Jesus died on the cross to pay for everyone's sins (sorrows etc.) thus connecting his crown of thorns to Cullen's allusion to his poem. This allusion serves to establish that everyone suffers if one suffers, if one is in pain, then everyone is in pain, etc.
The allusion in "A Farewell to Arms" to the title is symbolic of the protagonist's departure from war and violence towards peace and tranquility. It also references the famous line from a poem by George Peele, "His golden locks Time hath to silver turned."
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