Which line from the poem "Monet’s ‘Waterlilies’” by Robert Hayden includes an allusion?

An allusion is an indirect reference to a recognizable person, place, event, or work. “Selma and Saigon” alludes to real places associated with major events in the 1960s: the civil rights struggle in Selma and the Vietnam War in Saigon. The other lines describe light, space, and an imagined world without a similarly specific historical reference.

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